Some answers.
Typhon,please contact me through the website.
If you are using one inch pipe then it is simple to do, a nipple is simply a piece of 1 inch I/D pipe threaded on both ends. I can get these if they are in short supply . I purchase a 6 inch piece and cut it 2 inches long leaving a 4 inch piece, I then screw the 2 inch pieces in every other outlet and the longer pieces into the remainder, this allows 90 elbows to then be connected without interference. hope the enclosed pic works.
If you want to come out horizontally simple extend each nipple or use a coupling.