Welcome to the "Bear Pit".

It was mentioned several times here. Unfortunately the specifics may not have been.

Most of the changes were internal, but the two glass horizontal stab joiners came with thicker walls on the later versions to add strength. Just don't have a comparison or measurements. You can take comfort in that if the flutter problems are addressed the thinner tubes will likely work fine. They may not have made the effort to build better stabs in the later versions so may be necessary to tear them open to check for good bonding. ALL of the early ones were extremely substandard so even thicker tubes would not compensate for lack of bonding. the structure together. Ultracote White is a perfect match so relatively easy to get back to stock looks.

Therein lies one of the two biggest design flaws with this plane. The first is their stock elevator control system. Trying to have a tight and accurate linkage using a long balsa or hardwood rod will not really be effective. Add in the fact this plane has the least elevator deflection specs of anything I have seen, as well as the most pitch sensitivity, as well, makes for a rather bad combination. ANY free deflection of the elevators will lead to flutter Mine is currently back on the table to have smaller elevators grafted on to allow for better pitch control.

The second most obvious is their weak gear mounting. Wood is soft and not bonded on well. For reliability, especially with one with such long legs, means you need to beef that up.

Both version tubes were too long, so forcing the stab haves tight to the fuse would break away the ribs inside the stab structure. You have to shorten them a bit. Even then I found that general construction would show some gap when any portion of the stab touched the fuse. You could be a bit more aggressive when removing material at the root to get a good bond, but too much can weaken the fuse at that point. I loaded the gap with epoxy and FLOX till cured. FLOX, (Flocked Cotton) is a filler available from Aircraft Spruce that adds strength to epoxy bonds, (rather than microballoons which DO NOT!) and is sandable. First tried this when helping build a Lancair and learned to love its advantages. All my structural bonds have at least some amount added.