Nice project.
If you like take the wings off for transport I suggest to part them after the nacelles outboard 0.5 inch. That leaves you with around 49 inches of airframe without wings. There are only two wires to connect, ailerons and flaps.
The nacelles are very long, keep your fuel tanks as close as possible to the CG. Keep in mind a small gas engine can pump gas 2 feet vertical without problem. The DLE's are good for a 21 inch 3-blade.
With the retracts going aft, you need to balance the airplane with the landing gear down.
The front wheel looks more like 4.5 inches.
Yep nice project - looking forward to see that build here (pictures - lots of them
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Click the picture below...