For my rig i have 6 9/16 travel. so i'm going to limit it to 6.5.
My plan was to tap the orginal box. (i have a spare to screw up)
any cylinder would work, as long as its rated for the pressure. (1800psi should do)
Get the correct ends to mount it, and fab my own crap.
As far as limiting it, just spin up a stop tube, use brass (if you get a 7" cylinder, which is standard, make a half inch spacer and place it on the rod end of the piston, it can float). it won't gaul the rod or cylinder.
for hydro assist, i'm thinking 1.5" bore, .75" rod.
I had planned on using just a cheapo tranny cooler. and builind my own resevoir. I actually thing, i have 2 nissan ones, i was going to chop the bottom out of the other one, and weld the 2 together, it will look stockish, and all fittings will still work.
I just havn't had time, been traveling alot, and just want to go wheeling when i'm home.
in reality, its not often that i find it would be THAT benficial. I just want to do it, to take stress of the pitman arm. (i still have the old stock one, machined out to 5/8)