In the home straight now - sorted out a few details - welded on the hinges for the removable back gate, reminding me how much I hate that task, as the damn things never turn out smooth and free :((
The other addition was front guides/supports - the tub falls dead straight, but with a load in it, and sideways on an incline, I can see the front wanting to shift sideways, hence the bits of flat bar - I did the bend by cutting 2/3rds through on the bandsaw, bending, then welding over the cut.
In this pic you can also see the one of the (surprisingly few) mistakes I made - the 40mm cross-member should have been lower to rest on the drawbar, rather than flush with the top of the side rails. I used 30mm SHS to connect to the drawbar, and may add something more substantial if I decide to add hold-down latches like Kryn suggested.
Attachment 373778
I pulled it all apart again and managed to shoot a first coat of paint. The forecast for the rest of the week has a max of 12 degrees until Thursday, then it gets even colder, so need to get the final paint sorted in the next day or two...