Good luck with 'the project'. I wish you well having tried to do the very same thing with a 'bargain' a couple of years ago. In my experience rust is going to be the big problem, and the likely cause of an MOT failure if it isn't done propely - and that's the problem, welding can drain your budget.
Going from the photos, just looking at the rough cost of replacement panels and parts, not to mention labour/paint and engine/transmission fixes, brakes calipers/corroded pipes - you are seriously over budget in relation to what the thing wil fetch (having obviously had so much work done to it, as opposed to being 'original').
It pains me to say but I would get rid of it now, take the hit and get another which is a better platform for what you want to do. Just a quick look at fleabay and you will see 15 or so classics within your budget, any number of which is likely to be in far better condition.
Don't take this the wrong way - I'm only trying to give you the heads up, I just wish someone had put a word in my ear before I spent the best part of a year fixing a right old dog - only to end up with a hugeley expensive right old dog.