Thanks again for your great suggestions!
AHMTHAI, you are right its pretty strong with the 6mm marine ply wood, just some material I had in the shed.
My local store is selling 3mm, yet it looked to flimsy to be honest. You'll be screaming overkill in a second when I give you my final spec. After all its my first board.
Thank you OZCHRISB. Again, the width of the mast-foot came down to the materials I had on hand. You are fully correct in advising to make it wider and the next board will surely be more then the 90mm, currently. Note, the photo in my last post is in fact 3 pieces of wood. To cope with the sideway forces i was milling a pocket around and over the mast foot, using a router.
I didn't spend too much time thinking about the depth of the pocket in relation to how many glass layers it will need to fill up. So I ended up with a 1,8mm depth and filled it with 5x 6.5oz and epoxy, top AND bottom. I surely looks solid now...
DOWNUNDER, thank you so much for your kind offer, I truly appreciate it! After a lot of back and forth I decided to do a hand layup on my first board. I am also still missing a few bits and pieces (vacuum tube, pressure gauge, strainer) to get my own little pump going. Maybe I'll take your offer later on or at least some advice. I'm definitely going to look up Kirkside though, thank you!
Mast foot is in place, I've sanded the hole lot by hand ready for glassing. I'm starting tomorrow and my glass schedule is 2x 6,5oz + 1x 4oz on TOP, same for the BOTTOM.
Any suggestions? More? Less?
Thanks again and good winds,