Bill,
When it comes to using an enclosed trailer, our beloved GT is really nothing more than an above average sized C sports racer... with a few extra pounds.
A side access door would be nice, but no big deal if the trailer being used doesn't have one. The shape of the doors requires a good sized side door, in just the right location. I'm following Buds suggestion: just line er up good and straight, then winch er in. Piece of cake.
If you're fortunate, the trailer you're using has rings in the floor strategically placed north/south of the tires. Highly suggest securing the car with straps over the tires (as opposed to the mono or the elsewhere) allowing the suspension to do its job while heading down the freeway.
Thanks for posting all the progress with your build, Bill. It's been an inspiration (and a real confidence builder!).
Best,
T.