I fab'ed a quick carbon fibre top plate for my TS80 APO, so that I can mount my ZWO 60mm guide scope on top. Any other solution was going to cost money and add weight, and I had the sheet carbon fibre left over from my 10" imaging newt build, so why not.
Photos are attached. I have enough carbon left to make a top plate for my larger APO when I get around to it.
Its easy to find carbon fibre for this sort of thing, plenty on ebay. It's not the easiest stuff to work with, and you should wear a dust mask and safety glasses when cutting it. I cut mine out with a angle grinder with a thin cutoff wheel (ceramic). When drilling, use small pilot holes to start with to avoid wander and scratches.
For the structural engineers, it doesn't bend, twist, or sag. You could stand on it supported by two bricks on the ends and it would not give at all. Much lighter than alloy bar, and provides abit of 'steam punk' look.
