One thing i noticed now. How the heck do you reach welds between the pipes !
I was thinking of building the manifold piece by piece not everything in one go
Thats where things get interesting, if you look closes on the pictures, runner number 1 isn't actually tacked on, this is what i'll remove to give me some room, i'll add runner number 1 last.
Reaching between the pipes is the hard part, can spend half an hour doing 1 weld simply because of access, i've done all sorts of wierd things. Bend tungstens, half them sticking out fully, (a welder i know fused 2 tungsten's together to reach once) Obviously this makes gas coverage poor so you need to think outside the box. (or inside it)