Sorry for not answering myself, I have been off line for the weekend. Well, once you have used peel ply you don’t want to live without it, saves a lot of sanding and all the “impurities” from the epoxy is coming off with it. There is no need to make this figure eight tube, you can as well take down the hale yard in the same tube as the bolt rope.
I decided to have a go for the spar as I have some very bad experiences whit single alu spars shipped from abroad, and just the transport is more expensive than the whole mast homemade. Still the big test for this one will be on the water, so before you start to build let’s wait for that one.