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I decided to provide you with a quick assessement of each of your drawings. A quick key to what radius you will need:   2x physical length is the absolute minimum for a piece of equipment to operate (in most cases), and 2.5x will likely provide trouble free operation.  What does this mean?  An 89' intermodal flatcar will need at absolute minimum of 24-25" and would be happier at 30" A 40' box car will work on 15" but will be happier on 18"   Given the following facts provided by you: The space is 6.5' wide.  Plan 1 Plan 1 as drawn is a U shape plan. With the long legs of the U being on the long sides of the space.    In order to have a turn back loop, each leg would need to be a minimum of 48" at the end (22" radius loop).  This leaves 2.5 feet for aisle space and the other leg of the U at the widest point of the return loop.   Each balloon will occupy a 4x4 space, and will need to be offset from each other.  Given 11' of length, your long ballon will end about the 7' mark and the short balloon will likewise start around 6' to allow you to walk between them.    I would have to draw this out to scale to see if would even be workable. Plan 2 The two end boxes sticking down would need to be at a minimum of 4x4 to accoplish turn back loops, and you will need to add some triangles in the inside corners to support the track to curve back to parallel with the back wall. This eats up 8 feet of your length.  Providing you with only 3 feet for the center peninsula and two aisles.   Plan 3  Plan 3  is basically the same as plan two with out the peninsula (which Im guessing that you may have guessed wouldnt fit) Plan 3 again would require two 4x4 shaped boxes at a minimum to accomplish the turnbacks for continuous run (with the affore-mententioned triangles added to support the track turning back.   Question: Is there a way you could run the benchwork down one side of the garage or the other?  How tall is your car? Could the benchwork be over the car slightly in any area. Some food for thought.
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