OK, so a bit of 'meat and potatoes' now.
I'm at the point of carving up the lower hull now, and really, there is no science to this. Its just cut and glue it back together, with bracing that I hope will do the job. Here is the main objective, to make horizontal the underside of the sponson which is currently sloping.
So I made some cuts to raise them, leaving a small segment attached near the front, from the black dot forward. I made a bit of a mess of it and could have saved a lot of pain by making a straight cut. Unfortunately I was all over the place. The battery box has also been removed and the lid glued shut.
To re-attach the sides that were then flapping in the breeze, I made some side supports from plasticard, and some steps in the sponson from leftover HL plastic. Then I glued it all together with JB Weld.
That left some very ugly scars on the outside of the hull. It took a lot of cutting of small bits of HL plastic scraps and filling and sanding of putty. I had to hide the results in primer before I showed it here. Its not perfect, but some pigment will hide any remaining flaws.
I wanted to insert bulkheads and was originally going to glue them in as hull bracing. But they still weren't going to stop the sponson sides from sagging, so I will bolt-in two bits of aluminium bracing. For now I have the bulkheads slotted into 'C' channels so they are removable so I can get components in and out easier. Nothing is fixed in place as I am waiting for 4.1 gearboxes from Forgebear.