While we are discussing seating…
I had to move my seats many times to get the best clearance for me as I sit in driving position.
First, I am using the fiberglass shell seats that were made by D&R for my Diablo. They are 19" wide but could have been a little wider for comfort and still fit. They press against the side of your legs a little because of the padding required but not too bad.
I put my seats on adjustable rails from a Jeep CJ. I used just the slide rails that are about an inch tall. I notched the bottom of the seat shells so the seat is about on the floor at the rear. I had to tilt the seats to the rear to be comfortable and allow my head to clear the headliner. The tilt allowed enough space to place woofer speakers behind them in a box shaped to fit. I also made the seats move front to back with power. All that work to make them power was pretty much worthless because there isn't much room inside anyway but I did it.
When you position the seats, as mentioned before, angle the seats to parallel the side of the console. That way your feet will be pointing to the pedals and away from the front tire bulge. I also raised the outside seat mount 1/2" over the inside mount to tilt the seat slightly so you will get better head clearance with the trim over the window and door. You will find that you lean to the center of the car anyway to feel right while driving. Did I mention these cars are TIGHT for clearance?
Anyone building on a Fiero should realize the seating position places you back farther than a real Lambo. The dash was made to fit back from the windshield to create a realistic proportion to the interior. The reason is the Lambo put your feet farther forward, between the tires. The seat was positioned accordingly. That also gave Lamborghini more room for taller drivers to move the seat to the rear. Fiero builders don't have many options with that. You are seated back from the door glass and will lean forward to see past the door post.
So, recline the seat. Angle the seat to the console. Tilt the seat inward to gain side headroom. Do everything you can to lower the seat mount.
Don't forget the headliner position! I recommend highly you try to get the headliner as close as you can to the inside of the roof. I initially had 2" between the two but found out that was never going to work. I had to reconfigure the roof steel and flex the fiberglass headliner panel to arch upward over my head. I gained an additional 1 1/2" but that required me to modify the covers over the door and rear window to match the new upward curve. It was worth the effort.
Here is my seat video.
RT