I think they say in the US "hold your horses" and thats wat you have to do John.
Without testing _this_ hard- and software for some time, it's not handy to let make now the PCB's professional.

Make a few (10 or 20) CDI-PCB's or kits, start testing the CDI (not one person, but 10 or 20 differend persons with differend engines), listen wat they say about it, change or fix program / bugs, test again and if no one have complains you can start makinf real PCB's by some compagny.

A other point to attention befor you go to the PCB-factory.
If Jake gone make a new CDI-version, hard- and software, wat will you do with the old version ?
No one will buy a old version if there will be a new one soon.

I don't know how big / small the CDI can be, but a "eruo-cart" is 4" x 6".
A single or double sided PCB I can make it in 3 minutes, etsing and lighting, not drill and cut.
The most work will be the drawing of one single PCB, not to copy / past the rest to (example) the "euro-cart" sheet.

My advice, take some time to test and don't try to run faster then your shadow.