I can understand. I'm very new to DTG printing, but I have been known to have a specific talent when it comes to DIY. I'm a good integrator.
Let me explain it this way... I work with computers / networking / programming. In the offerings available to enterprises for software, you have shrink wrapped (expensive licensed software) customized (expensive services based deployments) and Free (open source).
To be successful, you either spend thousands (or hundreds of thousands...) on the normal options, or you fail. Few businesses can make open source work or even evaluate it properly. In my opinion, the key to making that "Free option" work is realizing it is currently broken. It's free, but provided to you in a non-working state. (Partially completed)
Once you realize this, you can evaluate it more closely. It's no longer "Free" but then it never was, it's costs are just hidden in different places. By deploying it, and cataloging what is missing, you can gage if it's a good fit or a disaster.
EX: Open source is typically broken, like an Arduino board reads a 1430, or P600 feed and operates a stepper motor perfectly... You base your printer on a P800, it may not read the input right, and it will definitely not match the movement right... Board (T-Dozer) costs $149 as a kit with stepper etc...
Important thing is that it will get close, and only a few lines of code or settings need to be changed to match the new printer type.
What's better, is somewhere you can probably find those settings from someone else doing a P800 with it... so now you need only to insert the changes. (You don't have to experiment and discover what they are...)
Hopefully you see why I asked the questions I did. I see things in DIY as a list of reasons it won't ever work, and a corresponding list of solutions eliminating each of those reasons.
DIY DTG won't work because:
1. Inks are different.
2. Cartridges are not re-usable.
3. Paper jam Sensors can not be tricked.
4. No white ink option. Or 1430 only has two white. Not enough coverage.
5. Etc...
Successful DIY:
1. Use Firebird Ink for Epson with any Epson print head.
2. Cartridge resetter, or order blanks from china... with reset chips on them.
3. Here's how you move the paper sensor so it still works but applies to the platen...
4. On the 1430 in RIP choose 130-160%, 1440x1440 and "large dot".
5. Whatever else solves the rest.
Any time I see elegant solutions like this, I always am curious how each bit was solved.
Keep up the beautiful work my friend! Good luck!