Originally Posted by andyuk697
if the sierra route fails whats the next low budget option of a doner
It won't fail, there are still plenty out there. I would advise spending more if necessary and getting abetter one. By the time you've paid out for everything, a couple of hundred saved on a donor will seem quite irrelevant. Get a runner and drive it for a while, find out if everything is working well, replace anything that isn't. That will be a good starting position.
Next potential donor is the E36 3 series BMW, but obviously modifications to the Haynes design will need to be made, and special parts will be needed also.