I particularly like the large curvature of the Bun-Hugger.  If I could do it from scratch, I would do the same thing. I did a similar thing but could not get the desired deep curvature because I was working with an existing sissi-bar, with a straight non-bun-hugger, of which I had to reuse materials. I sawed the fwd-aft bends out and rotating them outwards. The leaning strut had a curvature at the top supporting the straight bar. I cut that off for welding it horizontally between the two rotated curves. The strut now was welded slightly angled to the back of the bun-curve; the left over straight part of tubing was just enough to elongate the strut to fit the bun-hugger. I guess a drawing before and after would be simpler to follow that all these words. But being in Panama where the welder could not read a drawing, I cut and fitted the parts and he tack welded everything in place to take it to the shop for final welding.

For the benefit of the TOG members considering a Sissi Bar, I will offer variances:
.Concerned that I may not hit the cabin top angles right, I put teak under the angled stainless base plates which could easily be sanded to fit.  (note, I used home made teak plywood, three layers of each 3/16 inch thick glued under heavy clamping, to have bi-directional strength against splitting.
.Above the middle I put horizontal bars for hanging ropes and attaching stored fenders, etc. ; it would have been nicer to also curve those but the machinist did not have a tube bender for that size tubing.
.I increased the base of each of the three stanchions for putting an eyelet for fastening jack lines, one aft and one forward. Plus in the center for attaching the harness when working at the mast.
.As you can see after polishing the welding came out pretty smooth.

I second your opinion about Railmakers in Costa Mesa; excellent shop, great to deal with Dave. I had some very complex parts made by him for my stern platform, broken down for regular checked airline baggage and made to be bolted together in Panama. I believe Bruce put the pictures in the archive. Perhaps he can do the same with the above.

As you can see the location of Sissi bars and mast are different than yours...I have a ketch with the mast further forward...therefore one set of the dorades inside the bars. The aft dorade protectors are also made by Dave, but are sideways model (partially plagiarized from Terra Nova (John?) to fit a dinghy in between behind the mast (again, a ketch has the mast further forward leaving plenty distance between mast and traveler for a dinghy on the cabin roof.

Hans Kosten
Starlight Dancer, TY 37 ketch