So what I did was change the horizontal arm to allow a 1/4" mounting bolt as what is used on most tripods. I also removed the the cavity to strengthen the mount and also removed the level hole as I have a level on my tripod.

I bought an original plate and mount to add to this, so I also changed the transversal arm to include a 1/4" slot, again to be able to mount an original mount. I also removed the single hole, as I believe you need to slide the camera to set it.

The rest I kept the same using M5 bolts. Even though it is hard to get metric bolts in Canada, which is weird because we are a metric country, but way too tied to the states.

Anyway I hope this will help others out there.

*UPDATE so I printed these, and they worked great, but now I find the vertical arm bends too much, so will look at filling in the channel,

UPDATE 2*** I have made changes so ALL bolts are now setup as 1/4", you will need to print 2 knobs, I did not work on the base and mounts as it is something I won't use. The big change was on the vertical arm. I closed in the gap, hopefully to add strength. I have a Pro-line camera which weighs a lot more then consumer line cameras

UPDATE 3******* I have completed the changes, and everything seems to work fine, all bolt holes and nut/head holes are now changed to hold a 1/4" bolt properly. Length of bolts depend on what equipment you have, so you will have to test that out. I used a 1" bolt to attach plate to the horizontal arm, I then used a 1 1/2" and shorter (knob13_21) knob to attach the plate socket to transversal arm, then another 1 1/2" olt to attach the transversal arm to the vertical arm with the taller (knob16_21) knob, you will need to tap the bolt into knob with hammer. I made them tight fit.