I do not wish to tell anyone how to do their business, however, I would hate to read about a business failure due to improper planning, under capitalization or just bad timing.
May I recommend a few things:
1. A market study ( can the market stand to have yet another car company ).
2. Company profile and assessment of assets ( you are buying a company? ).
3. New company profile ( what are your skills and what do you bring to the table? ).
4. Corporate leadership structure ( more complex as you introduce more things ).
5. Legal assessment ( people enter "arrangements" with the best intentions...BUT ).
If a good business plan is written and a suitable quality plan put in place, you should be able to use BANK money over your own with minimal investment.
Just my suggestion.