Under the front seats, there are four “systems brackets”, F-1084A/B, which have slots for a fuel line, brake line, and electrical wiring. In my case, there are two fuel lines, so one issue is how to deal with the return line. Another issue is the fact that s/s braided teflon lines are different in diameter than the Aluminium tubing lines that the system brackets were designed for. There is apparently enough scope to squash them in with a sliced apart grommet.
None of this sat well with me, and it was a simple matter to design a replacement upper bracket section and 3D print it in Nylon. There are two right-hand and two left-hand brackets, which have snap-in rings for two fuel lines, one brake line, and electrical wiring. Each ring has a slot for anchoring a cable tie, or waxed string tie, if needed. Each part takes about two hours to print, and bolts straight onto the standard lower systems bracket F-1084A. If in the future I need to make a change, I can simply print up new brackets and bolt them in place.
The brackets weigh 7 grams each. This replaces the metal upper section (F-1084B) and three snap bushings, which weigh a total of 9 grams, so there is no weight penalty in this change.
Although I’ve in general followed the Van’s plans, like the wings I’ve tended to do things less incrementally. In the case of the fuselage sections 28, 29 and 31, this has resulted in a large tear down, de-burring. countersinking and dimpling activity which has occupied the last few weeks. The list of jobs to do seemed endless at times, but I finally got through it. Not a lot of pictures across this time, my bad. There was a very large pile of parts to be primed at the end of this exercise. I primed everything except the five skins (aft/forward fuse, upper forward fuse) in one marathon priming session. I then went ahead with riveting those parts I could in the fuselage structure, as well as riveting sub-assemblies together. This reduced the huge pile of parts to a manageable size.
Next job is to prime the five skins, and rivet these to the fuselage.