Thanks guys.
I do tend to go a little astray with my methods. Guess it's my machine design background, and making "jigs" for fabrication. Case in point, below.
I made a jig for the floats. Distance between pins in the front struts, 43mm. So I set two locating rails for each at 43mm centers. Easy done as said as the inside of one to the inside of the other is 43mm. Then set the other 10mm out and the floats sit comfortably between them. Some bluetac and the sit fast. The little block at the back I put the Step of the float against so the were in-line. I hogged out holes for the rails between them, and the criss-cross tubes. Glued them in place and the pins of the struts just fell in place. I'll have to do some filling the gouges at the ends of the bars and tubes. Then I will put the buckles in the struts for the wire bracing and I hope to be ready for paint overall.
I sailor on, sorta.