OK, so the diesel tanks are progressing well - the plywood arrived on Tuesday and the fibreglass stuff on Wednesday. I cut out the panels for both tanks on Tuesday afternoon, and fitted them together on Wednesday morning. In the afternoon I put thickened resin fillets in all the inside corners.This is to prevent the formation of voids in the fibreglass cladding. I had other things to see to on Thursday, but today got most of the insides of both tanks clad with chopped strand matting; there's one panel on each still to do and hopefully I shall get that done tomorrow, and make a start on the outside.
With the strengthening provided by the interior clading (the panels are only nailed together) I intend to radius all the corners and then clad the outside in woven rovings so that the plywood will be completely protected. I only bought cheap stuff with that in mind. I'm using 10mm.
As of this morning the weather forecast for next week looked a lot better so I've made provisional arrangements for craning out that afternoon, but the updated forecast this evening didn't look so good so we'll have to wait and see.