I had some drawers for a bakkie drawer system cut and bent at Schuurman and was very happy with the result. I did my powdercoating at Castellocote, it came with a few marks and blemishes but were well priced.
What are they quoting you?
What CAD software are you using?
I've been using my 1310 on the bike for years, it also seems to be reasonably resistant to water as I've used it in the rain before with no problems.
I bought the RAM cradle and some type of pipe clamp from Plumblink to DIY a bracket.
My dad and I took a trip up to the Angolan border, we trailered the bikes up to Windhoek, parked the bakkie at Elisenheim and went from there up to Ruacana where he served in the army in a small building overlooking the Ruacana falls:
Cape Town -> Windhoek -> Swakopmund -> Uis -> Palmwag ->...