awesome! i bought project cars also!!
i had assetto corsa, but i was getting frustrated getting into public servers, and i really wanted to test out my newly hand made sequential shifters..
i bit the bullet and bought project cars cause it was cheap. it was fun being in a driving setup.. but assetto corsa physics feel way better, with project cars a tad bit on the arcadey side.
if your building a homemade car-like driving setup / pit, i
would suggest a table-like solution, and not what i have with the post in the middle. my post is sufficient in which i can make it adaptable to my TM warthogs, but it is daymn annoying doing toe in braking, the post gets in the way.
im planning to make inverted pedals. maybe higher and father can alleviate the annoyance of the post in the middle being in the way. which leaves my second suggestion.
make sure you the base of pedals compared to the top of the chair is less than 10". if your both your pedals and chair sit on the ground , and the chair is high (such as an office chair), you could be in for carpal tunnel in your legs. your legs so be almost straight ahead. (i am learning this the hard way)
here a recent photos i took including my box-in-a-box. good luck with ur design!