RE: install a tailwheel
I perverted my SIG Kadet Senior ARF to a tail dragger. The TW is a Sullivan tailwheel (TW) bracket for 40-60 with a 1" wheel. Like the LT-40 the rudder is not accessible for controlling the TW. My plan was to augment the wood rudder control rod with a 2-56 pull-pull system for the TW as there was a straight shot between the servo and the TW.
TW: 1st thing I addressed was fuse structure. Covering was rolled back from the tail. The fuse bottom balsa sheet was cut away. Several pieces of balsa stock was added for support. 5-ply plywood was added with 4-40 blind nuts that matched the TW support. Reseal the covering over the new ply bottom. A couple of holes for the TW bolts. Plumb the pull-pull to the rudder servo.
LG: Add structure - I cut a 1/4" plywood plate to fit in front of the wing mount former - about 2 wide. Epoxy plate w/ tri-stock. Locate the LG such that the axles are parallel and in line (vertically) with the wing's leading edge. Secure the landing gear & drill holes for 1/4x20 nylon bolts (4 in my case). Remove the LG and open up the fuse holes to accept 1/4x20 blind nuts. Using metal screws, draw the blind nuts into the holes, adding epoxy under the shoulders of the blind nuts. Oh yea, make sure that the tri-stock bracing leaves room for the blind nut shoulders (emmm, been there and haven't done that).
I figure pictures are a good thing ...