Everything you need is here in the forums and the 1900 clue book. Remember the clue book is just that a clue. Measurments are a guide only.
Got most of it i bought a kit from inkcart.com used them for r1800 ink and cartridges no problem bought a kit for unclogging heads with big needle and rubber tube works fine but slow.That's a bummer, maybe someone in the forums can help with a tough clogged head solution. I see some youtube videos that may help. Sometime those guys use harsh chemicals that can screw up the head to the point of extinction.
Particle board is different from mdf.
I dont like either. 1/2 inch birch is a good choice.
Mdf must be sealed to prevent swelling.
Link to page below sorry missed this post..DrDeath where did you order your CISS cartridges from?
Use 24 inch rails. Height of walls on platen box is up to you. I find about 1.5 inch to 2 is good it just holds the excess shirt. Early comercial printers had about 6 inches new ones now may not have any.2 questions What is the length of the rails 24"? and the box walls pieces height is missing from the plans..