I was curious, my 24 footer had a work bench on one side at the front a tool chest on the other side a generator mounted on the tongue and I parked a golf cart between them all the way against the front wall. This left me about 4 inches between the cart and the front bumper of my fox body. I...
Switch
Use a momentary switch and mount it where you want. If you bump it while driving nothing is going to happen. You have to set the brakes then push the button to hold the brakes, it won't just apply the brakes if you push the button.
AJE
I had a AJE K member in my 95. The motor mounts to the K member were very flimsy. I added a diagonal brace to stop the front to back movement. Maybe they have addressed that issue.
Input Shaft
The input shaft is a simple pull it out and slide the new one in. I currently have the 5R55 completly stock with a P1SC and it has held up fine. It has 88k on it with 10k of those with the blower. It should be close to your power numbers.
Wheels
Mine are actually chrome plated aluminum wheels from Ford. I have a pair of polished ones but they are dull compared to the chrome ones. I guess I am old school, I really like the chrome and can't stand the black wheels. lol I bought the complete set off E Bay from a Ford Dealer for $560...
N2O
Its all in the tune. A friend of mine is running ultra street and spraying between 350-400 HP on 1 plate with no foggers allowed. You have to stay on top of the fuel pressure, timing and bottle pressure because at tha level you dont get a second chance. He has to pull plugs after each run...
Sway bar
It should be pretty simple to fab a mount for the sway bar mounts. Subframe connectors and rear x-brace would stiffen the body, I don't think that is the problem.
Line lock
But you also set the line lock at pre stage then ease into the beams, it keeps the cars from rolling when staged. It doesnt take much brake pressure to hold the car for staging.