Good luck on your new shop!!! I was self-employed most of my working years, and most of the time I had a jerk for a boss!!!! It's a lot of extra work and is a constant learning process! Taxes, insurance, and regulations can often be tougher to deal with then the most irate customer you ever had nightmares about!!!

Just a suggestion, until you have the equipment and knowledge to do all the engine machining and assembly, I'd leave it up to a competent engine shop.....Main reason being that if you touch the engine last, guess who the customer is going to hold responsible for any problems with the engine??? I never thought it a good idea to warranty someone else's work!!!! I much preferred to let the customer do his own dealing on an engine, I was willing to make some suggestions and answer questions, but that's about it.!!!!! IMO a new business is going to have enough start up difficulties and expense without assuming the liability for someone else's work!!!!

Good luck on the new venture!