Re the fuel tank, yes. So I took all the rear stuff out the inside to get to the plate that covers the fuel pump, to make it easier for the bloke. You could also do as lot of stuff to free the tank strap connections. You could even take them off, one by one and replace them after greasing the bolts and captive nuts so the welding guy can do it easily. I don't know how brave you are re the pipe connections, I simply cleared all the muck and rubble from around them and sprayed them all with WD, I think, to make them easier to remove and replace.
I am very surprised there is that much difference between the two legs. In fact I fear the better looking one is just a fag paper's thickness away from being as bad as the other. Once the tank is off, you might as well get both done at the same time.
As I said £200 is what I was charged so that is a guide price for you, and I didn't free off the tank fixings.