If the gasket repairs are only because of weeping, and not full on leaking on the floor, they can be addressed later, or just ignored. Tower deformation is an easy fix, post#6. The strut guide supports will need to be replaced. Many of the other DIY stuff can be found here and here.
Only you can answer the question about doing it yourself, look through the DIY library links and make you own assessment.
Control arm bushing replacement, clutch repair, and PS hose leak fix can be performed at the same time.
There are three Bentley iterations for the first generation MINI, the hard bound with electrical troubleshooting is the most comprehensive across all first generation model years.