If you do decide to build them yourself, do a huge favor for your future self - keep a hardware inventory of what components are in what machine. If you do the planned 15-20 machines a year, the hardware in your shop is going to span 4 years, which is an immense amount of time. Considering that by the end of the fourth year, you will have done maintenance and replacements on the 1st year machines, you are going to have a huge mix of parts.
Grab up something like IRM so that you can keep track of what is where and which machines are having which problems. It will take a little more time to setup initially, but you will thank yourself profusely for it in about two years (or less).
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Asset management is critical.
If you do decide to build them yourself, do a huge favor for your future self - keep a hardware inventory of what components are in what machine. If you do the planned 15-20 machines a year, the hardware in your shop is going to span 4 years, which is an immense amount of time. Considering that by the end of the fourth year, you will have done maintenance and replacements on the 1st year machines, you are going to have a huge mix of parts.
Grab up something like IRM so that you can keep track of what is where and which machines are having which problems. It will take a little more time to setup initially, but you will thank yourself profusely for it in about two years (or less).