the only way you will have an idea of what your up against is by getting underneath and having a bang around with the hammer. they will for the mot at least when you hit everything if theres anything left standing
you will have an exact idea of whats what and where you go from there or you could take it in get the welding done then the guy says ive found another hole ill just plate that oh! ive found another its ok ill plate that too oh look another by this time youve clocked up a £600 bill.then do you say carry on or do you draw the line and cut your losses pay him the £600.for the sake of what you could of done yourself spending half underneath having a bang about even if it looks solid you hit it .looks are deceiving as we all know
i did mine with a wirebrush head on a drill wire brushed th whole of the chassis and floor then got the hammer to it and got a major reality shock!!!!!!

but i said ive got this far i may aswell carry on
there must be someone you know who can at least help you with the machanical work at least or invest in a haynes manual and get stuck intoget the bill down the dearest thing is the welding
if i had taken mine in a garage and asked them to weld it up after they had picked themselfs up off the floor laughing i could say the bill welding aloan would be some where round the £2000-£2500 upwards as it would be classed as a major restoration job we had to support body work and keep it square to stop it collapsing it was like ajelly
so thats how i would start that way before you spend anymore money you can get an idea of the cost
sorry if thats not what you wanted to hear or we could be pure evil and tell you what you want to hear and tell you it will sail through the mot and let you get an even bigger shock when they tell you what its gonna cost
so id go and fetch your hammer mate good luck and i hope i hope its no where near as bad as mine