Baby Lightning Streak

Hi, Agustin. Yes the two are similar. I'm looking at both Brodak Streaks right now, and both say 26-1/4" wingspan. Topflite must be different. The Brodak Flite Streak fuselage is 17-1/2", which is 2" longer, so that would make it a little better if you wanted to fly precision. But the LS might have more of a tear-up-the-sky fun factor. The shorter fuselage of the LS should turn a little snappier than the FS(that's hard to imagine). Your plan sounds good, and yeah, leaving off the LG is fine too. These are two of the best 1/2A planes ever flown, in my opinion.

Either of these should be most competent for 1/2A on 40-42' lines in the wind you must have every day in Hawaii. A 5.5x3 or 5.25x3 prop should seal the deal. If you're inexperienced, a 6x3 might be a good tame starter prop. That'll keep the engine under it's power band until you get comfortable.
Rusty

EDIT: The first place you're going to break it is at the fuse right near the stab, When that happens, reinforce the repair with epoxy and fiberglass that ties the underside of the stab to the fuse. It won't break there again. In fact they are extremely durable after you get past that. Re-check the CG, and if it needs weight after that inevitable repair add nose weight as necessary. I usually use 7g square weights right between the beams if necessary. I've been known to fill the cavity of the engine backplate with lead too.