I think you are going to get a shock!
Assuming you want to certify and not just maintain the a/c (to work on a/c you don't need any qualifications just a suitably experienced engineer to oversee your work). Then you are going to need 5 years relevant experience, with at least 6 months in the preceding 2 years on the specific types you want to certify. It may be that your pilots' qualifications will give you some reduction in the experience requirement down to 3 years (but don't bank on it) In short it's a long haul to support what may be a hobby. But then again if that's what you want then go for it.