I’ve had a ‘computer desk job’ for knocking on 24 years. In that time I’ve considered doing the same a couple of times but…
Easy one first - tools. Like others have said, you’re way off. As an amateur in a single garage I have a few thousand invested in tools. Hand tools, battery tools, air tools, welders, compressor, lights, lifting equipment, on…and…on… and I still can’t do everything I want to do (I really want a proper lathe and a bigger mill).
Then the less obvious - using your body to earn money (like any of the trades) is not something to take on lightly. If you injure yourself, you can’t work. If you don’t use correct PPE you will cause yourself long term problems (my hearing is damaged partly from using grinders without ear protection, my back is easily put out after incorrectly lifting things in my youth etc..). And then there’s just the general grind of working in harsh conditions - a workshop is not a fun place when it’s minus something or hot enough to fry an egg on the roof.
And then there’s just the straight-up hassle of running a business. As an example, have a look at the trouble Barum Engines (YouTube) have had with a vexatious customer…
What killed the whole idea for me was having a small taste of it. I rented a workshop with some friends (used to be active on here) and thrashed out a couple of builds. The idea of doing that day-in-day-out was just not going to be fun.
While I still work on cars for fun, it was far easier to work out what I didn’t like about the day job and fix that. A couple of job changes and I earn far more than I would in a workshop and I’m not wearing out my body doing it (and I actually enjoy my ‘computer desk job’).
All that said, you only live once. Give it a go if it’s something you want to experience first-hand. I’d look at people like Guessworks, AC Dodd, CalverST, TCK (to name a few) - they are successfully running businesses based around classic cars (albeit in fairly specialised areas - that might be the key…).
Edit:
Just to pickup on the tools again as an example just sprang to mind. I bought three new Wera torque wrench’s to cover the ranges needed in just Minis. The cost of those was ~30-40% of your budget.
Edited by Icey, 23 March 2023 - 09:15 AM.