There should be plenty of detailed comment in the archives on StukaStunt forum.

The TF Flite Streak ARF is usually well-done, and quite light. The only concern I'd have with a 36X or similar is that I recall them as pretty strong shakers. The front end of the TF ARF has had some comments about being a bit softer than the guy posting would have liked. There have been some suggestions for how to stiffen it, or at least, how to improve the 'hardness' for the engine mount bolts.

The original question was about the bellcrank mounting, right? The BC mounting is at least as solid as the original TF FS 1950's kit, anyway. The leadouts were discussed on various sites.The TF ARFs have used an odd looking method of connecting the leadouts. Several of us have changed them to what we prefer. Not particularly easy; may involve some oral encouragement (cussing); but a definite 'ease of mind' effort. Haven't heard/read much about this with the FS ARF, but frequently about the Nobler ARF.

I'd have jumped in sooner, but just back from a week traveling.

BTW, be sure you balance a bit forward of the indicated CG! 3/8" to 1/2" ahead for starters... The Flite Streak is a fantastically maneuverable design, and the TF ARF is light enough that you get ALL of that!

Have FUN!