I would keep it 90 degrees from the tank fitting, (and angled to vent rearward.) Keeps the fitting higher out of the water, less chance for water intrusion.

I agree with Boo. Also consider a access watertight pie plate that will allow you access to the backside of the vent should you need to replace it in the future. A extra 10ga Pull Wire from the access plate back to the the fuel tank elbows (like the Pink grounding wire from the fuel fill) should be in your thoughts. You never know !

It is really important to make sure there are no low spots in the hose; it has to go up from the tank fitting or gasoline will accumulate in the low area just like a P trap and it won't be much of a vent anymore...

I've been slowly making some progress. The main deck is cut and fitted. and the fuel conduits are drilled and fitted. I've realized I messed up my main conduit location so i'm going to dig out some foam and move it back a 2'-ish. I also decided to lower the cockpit floor more than originally planned. I'm hoping to get the front stringers and deck cut this week.

Try the acrylic jigsaw blades too. "clean for plexiglass", they have red paint on em, Bosch too. They last a long time cutting glass and cut real cleanly...

I'll pick some up. I forgot to say I've used the 30 grit saw blades on the coosa and have used the same one through the whole project including the transom, and it's still cutting great.

How many cf's of foam does everyone feel is necessary for a 20' to be positively buoyant? I figure I have ~16 cf(1,024 lbs) in the stringer, if I can get to ~20 cf(1,280 lbs) is that enough? I realize the more the merrier but i'd like as much storage a possible.

Looking good, can't wait to see how this comes out! Will be very functional.

My neighbor used to have a Boston Whaler Menemsha which was a rare model made for camping and the like on their 16ft hull.

Keep the photos coming!

Any fuel vent recommendations? I was looking at getting the Attwood–Flush-Mount 316 Stainless Fuel Vents.

Some progress photos. I need to order more epoxy before I'll be able to glass the decks.