Greeney said..Lovely looking board, Malo. You certainly have some skills. Love to see more pics when you are ready, please.

Interesting interview with Josh Hall here (and Damned67... he doesn't like twin fins in longer longboards) :
www.liquidsaltmag.com/josh-hall-the-gliderHere's an excerpt or two.
Why ride a Glider?The length of lines that you can draw on a nice section that runs. And you if you go parallel stance, you can just stand there and literally do nothing at all. To me that is the ultimate in the trim and glide thing. It's my favorite feeling in surfing. It's just buttery, it's smooth, it's fast, and it's just effortless. That's why I put the phrase "Slide The Glide" on all of my boards ...
... it's the purest form of stoke that you could ever imagine.
What about fin setups?My own research has shown that twins on anything above 8' (like the Geppy-style keel fins or the high aspect tins) don't really give the right feel. These days, most gliders I am making are single fins - I'm moving back towards single fins and less 2+1's. They just feel so good going through the water. I've got an 8" fin on a 10'10" I'm riding right now.
I have an 11'2" Josh Hall Super Swallow with the option of a 2+1 setup. I'll provide some feedback as best I can about the different fin setups i've used with it.
As a Single - I mainly use an 8.5" 4A as a single and wouldn't go any bigger on the fin. I have also used an 8" 4A. The 8.5" is the sweet spot for this board. Great drive on turns and speed down the line. In anything over head high i'd down-fin the board to an 8" or even a 7.5". The rail line makes up for the smaller fin anyway so don't over-fin these boards.
As a twin - This was interesting. The Super Swallow comes with dual FCS tabs for the side bites so it's very limited when it comes to fin options. I used a pair of pretty standard looking fins. In good waves the board gets up to speed very quickly and flies down the line. But, as happens with twins, they want to track. With so much rail in the water they tend to track even more. So tipping the board on rail with speed can be troublesome. Look at Ray Gleeve riding his twins - he really nurses the tail. It's more of a flat turn, than a rail turn - depending on the speed he has at the time. The faster he goes the flatter the turn and the more 'nursing' he does to turn it. Twins get a bit squirrely - even on a glider. I like the feel of the twin, it just takes some getting used to.
As a 2+1 - I enjoyed this. I used an 8.5" 4A again with tiny Fitz 2.44" single tab side bites. Good drive, especially when on rail. I would def use a 7" or 7.5" next time. The 8.5" in this combo felt over finned.
IMO gliders should probably be best ridden as a single for all-round pleasure. But the option of a twin is something I haven't dismissed altogether - it just needs some tinkering. Maybe a keel style with more flex (reduce the base, like a cut-out base). The 2+1 with a very small side-bite i've found to be a very good compromise.