Looks awesome especially for the first go around. Have you had it on the water yet? Try to get out in it just on some flatwater to make sure your seat position is good very sensitive in playboats, but usually can adjust by adding foam to backrest or shaving off backrest some.
I agree with the previous comments the bolts will def hang your feet up at that length. I've found sailing stores have the best selection of nuts and bolts unless you have the means to cut them. Also I second what gonzo said about knee straps. I liked to use snowboard bindings for my knee straps cause the rigidity allowed to slip in and out easily without having to unbuckle 4 straps everytime. The snowboard bindings have been prone to break but i never had any problems with them for the knees cause they don't have the same strain on them as the thigh straps.
Do you have a quick release coming out of your skirt? It looks like you do. I always had a quick release system and after my first one I never boated without it. I liked to use the thin climbing slings as my "pull cord". Like this
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Also I suggest putting some sort of leg spreader in there even with knee straps. I would just glue triangles of foam on the hull near my knees to keep my legs spread.
Hip pads will likely have to be shaved moved and adjusted once you mess around with it. Some people love hip pads others dont bother. I liked them especially for playing, but be careful on the height for a few reason: they can make your skirt more prone to pop, can make it harder to get out good/bad thing, and most of all it makes it harder to 69 boats when you have multiple boats on the rack.
It is a super nice looking conversion so far def prettier than anything I ever put together. Make sure to make lots of adjustments and get it right. Outfitting is incredibly important in a c1 more so than a kayak and it can make the difference between a fun day and an absolute miserable day where all you can think about is getting out of your boat.
Some people like ankle blocks to raise the feet frim being completely flat, but I never found them to be very effective.
Not sure if the link will work, but here was one of my setups that I liked. I used the dagger pedestal here but you can and have done basically the same with just foam. Actually this was the first boat I did with a quick release and knee straps and I never looked back. I did eventualy change the quick release system and ditched the dagger pedestal because it was so heavy, but you get the idea.
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Puts the execution of my conversions to shame...