Having been involved in more than one track conceptual design project I've got more than a few ideas. Most new facility builds are confined by two major factors: budget and lay of the land. Last time I put figures to a spread sheet the raw cost of a 1/4-mile racing surface with walls, timing system, national-event spec shut-down, catch nets/pits, return roads, and staging lanes was just over $1 million. Start there, and work your way out.
Having spent more time over the last decade at non-racing indoor and outdoor sporting events I've developed a new sense of appreciation for aesthetic designs that also provide for excellent function. I like the feel of a classic baseball stadium with exposed support beams, covered seating, seamlessly integrated suites and VIP viewing areas, unobstructed sight lines, and an intimate proximity to the action for all attendees. We have a great example in the Houston area for the basis for my ideal drag racing facility design in Constellation Field located in Sugarland, TX. This stadium is home to a AA baseball team (Sugarland Skeeters). Seating, suites, general admission, and restaurant capacity is just shy of 15,000. The individual seating for the bulk of the ticket holders is the lower concourse while suite and restaurant level seating is the upper concourse. The outfield seating is a combination of inclined grass (like the new Dragway 42 and Perth/Sydney in Oz) that has a kids playground and splash pad area in dead-center field. I would start with a design like this for the stadium portion of my dream track. Maybe even split the general seating area into two concourses and place the suites on the third level to give the facility a "canyon" appearance from the track. This would also raise the "shadow" area for the track to help temps in the latter part of the day.
All seating and viewing areas would be a minimum of 8' above the highest level of the retaining walls. Nothing worse than grabbing some up-close seats and only being able to see the roof of a door car or the wing of a dragster. Dig the track down into the ground and/or raise the base of the seating areas...like Dragway 42 is doing.
Bose sound system throughout the facility.
Integrate a nostalgic tower section into the stadium structure. I'm partial to the round towers of Tulsa and OCIR.
All entry to the facility comes from the top-end area of the track while all exits are out both sides for all attendees (racers, fans, employees, etc.). Nothing but foot traffic and race car/support vehicle movement near or around the starting line/staging lanes area.
All sounds, lighting, visual, and multimedia elements controlled from a central location.
Large, clean bathrooms, shower facilities, RV hook-ups at every pit space, wooded camping area, and lot's of non-racing activities for kids (play ground, splash pad, etc.).
Secondary 1/8-mile junior dragster/no-prep/street car track (like E-Town has).
Permanent Jumbotrons placed throughout the stadium, smaller units in other high-traffic areas of the facility. Electronic billboards, as well.
Elevated premium RV parking similar to the set-up Bristol offers.
North/South direction of track travel with temperature control.
One thing I've often toyed with and presented on an early project (a certain track relocation in the DFW area that did not come to fruition) was the idea of separated functional pit areas and spectator walking/viewing areas. This would have required some pit area set-up changes on behalf of the touring professional teams but in the end it would have resulted in lower event insurance fees and improved movement for both the teams and fans. It would, in simple terms, close off one end of the pit spaces and restrict it to pedestrian foot-traffic only while the other end is reserved for vehicle movement. The insurance company loved the idea for obvious reasons (mitigation of risk by removing fans from the traffic areas of the teams and cars). The initial idea was for there to be three very, very long rows of pit spaces with spectator viewing through the front of the pit spaces and team access through the back. Each space would be wider than normal to provide for better sight lines into the pit (no more parking rigs so close to one another). We had the architecture firm do a few layouts and it looked to be feasible for our project (and the budget we had). Never got to try it.
Food at my dream track would be better than anything you could get outside the facility but would also be priced competitively. Variety of food themes, perhaps even an active restaurant with public access seven days a week with track views. Depending on local blue-laws I'd want to have a bar/lounge on-site. Blue Bell Ice Cream is a must.
Displays for vehicle performance would be placed in the typical finish line location along with other spots. Displays would be screens rather than individual number panels and would be able to show graphics or any other animation.