I'm quite the opposite, no dust anywhere, doing only water sanding. for the mast, it wasn't that much work either, maybe wood profiling about 2-3hrs. Front wing, maybe 3 hrs.
But the process to get there, hmmm. I was struggling with a first mast carbon wrap, and binned the complete carbon. Than made this simple jig (sorry if repeating):
The main problem for me is precision drilling. I have no fixed drill or something so to get everything square is, well, difficult for me.
This is what I mean:
Mast should be perfectly aligned with a fuselage, and I can see my mast is not. This is more because the mast screws were not done perfectly. So, you need a jig for the screws as well. Which adds up to the build time. I also needed a jig for the wing screws, but ignored this and guess what? not 100% aligned again.
I would go with a fixed mast/plate/fuselage next time but this problem still remains. If you built a mast/plate connection first, you won't be able to see if the mast is aligned properly.
And, as I see the LF mast (this is the plate), is way smaller than Manta on which I based my profile:
At least, I can use this plate as an example for my build. Im also surprised how heavy this plate is (inc. a rubber): 579 grams
Manta mast is 1821 gram
My carbon mast and a fuselage now is 978g. The target is way less than 1.8kg for a foil. Plus board.
So to answer, no FG anywhere. Only carbon and a wood core for mast. Carbon 22mm tube for a fuselage, reinforced with heaps of carbon. All of that to have it light coz I do not want to be axed with a 2kg mast.
And knowing myself, will jump with it on a first occasion
I also think a wing size is very subjective, there is no way to find the perfect size if not trying heaps wing sizes, which again depends on conditions.
I recon your short mast idea is not bad but very limited usage.