With my P-47 1/8 build, I was able to fit E-Flite 85 degree retracts with 4 inch Robart diamond tread tires by angling the gear back so the tires go into the center of the wing (chord-wise). This required chopping the main spar and placing spars ahead of and behind the main spar from the root out to rib 7. I used spruce for the spars. Had to custom cut plywood dihedral bracing for reinforcement between the spruce upper and lower spars. I also angled the landing gear mounts way forward so that the axles will be under the leading edge of the wing when extended. Alot of work that hopefully will be worth it. I also installed gear door, including working inner doors using Sonic-Tronics offset spring hinges. For the tailwheel, I used the Robart 121 retractable wheel assembly, but mounted it on a custom made plywood fuselage former that fits forward of F9 (I think). This puts the tailwheel in a more scale-like position and gets the whole assembly in a part of the fuselage that's a bit wider. This makes it a bit easier to install the working tailwheel doors, which were a real pain to get working properly. I went through 3 designs over a two month period. Wish I had taken photos during the build to show the details, but these are all ideas taken from other threads on this web site forum, so the information with photos can be found. I'm almost ready for fiberglass and paint.