Reply to "3-Car Garage Layout"

Any island style layout automatically constricts overall size and available curvature.  You many wish to try a walk in, no popup around the wall concept. 

Around the wall design automatically provides the largest track plan footprint for any theme in any room with space for generous curves.

Getting up on a platform or crawling on your knees gets real old real fast. 

Mianne makes a real nice rolling lift up.  Consider a design revamp.

Having done a few garage layouts something I found helpful was to seal off the garage door and stud a wall with two layers of R-15 fiberglass 3 1/2" insulation, 7" total yielding an R-30.  then drywall the inside.

12"  of insulation and a separate Trane HVAC in the ceiling with 6" of insulation in the  walls.

You can hang platform knees off the studs as in photo providing a leg free clear access / storage space wall to wall.

This is a 2 car garage with a 25 X 25  rear addition.