I like the lexan booms. Bummer that the holes through them make them stand out from some angles. I bet if you polished those holes they'd all but disappear. A bit of 400 or 600 grit wet dry sand paper and a 1/4" dowel with a slit cut in it to hold the paper followed by a q-tip with some brasso or car polish would make them nearly invisible. Should be able to flame polish lexan as well but I've never had much luck with that, some friends swear by it and have it down but I can't find the touch and never get good results.
I love the idea of an all lexan multi. But after swapping the body on my quick and dirty budget 250 from 1/8" ply to 1/8" lexan I found it a lot harder to see in the sky
I have some acrylic rods I've been thinking about trying to make arms out of. Don't think the acrylic rods are strong enough though. Might work on something a little smaller sized for 5" props max. I need to dig those out and take a look at them one of these days. The lexan body was also heavier than the plywood which surprised me. Biggest problem though was I messed up assembling it and rotated one piece 90 degrees, and since my design wasn't as square as it should have been that led to some major warping when I assembled it. One of these days I'll find some motors and ESC's and get that frame back in the air.
You should really push to finish the minimal look. Imagine it with an afromini and spektrum sat:
Or if you want to keep your flysky but clean things up you could grab an arduino pro mini and a A7105 RF module (About $5 total cost but you'll probably have to buy 2-3 of each to get them that cheap) flash midelics flysky RX software and have a small PPM with failsafe RX that takes just 3 wires to connect. The longer 6 wire harness is between the "brain" and the "radio". Since the antenna is part of the module on this module I figured having some length there would make it easier to mount the antenna. This bench tested great - but I didn't fly it because I got my spektrum sat RX and it was smaller and lighter and a cleaner easier solution for about the same price. But I already have a spektrum TX module for my radio, if I still had flysky I'd be be cleaning up the wiring on the LED and getting that board mounted
I'm actually about to tear my knuckle quad down and put this same basic setup in. But in place of the afromini I'll be hooking a MPU-6050 sensor onto the arduino along with the A7105 and letting the arduino be both FC and RX at the same time. I've bench tested that as well but have to clean up the wiring a bit more before I can actually put it on a quad.
Swap to some KISS ESC's and clean up the wiring a bit and this thing could all but disappear in the air
Now you've just got me daydreaming about how to make the most invisible multi...