Looks like everything is included except the hoses and clamps. As I would most likely follow your installation (why recreate the wheel, i'd probably find a way to make it square), can you post the part numbers you used and approximate hose lengths, that way I can just order everything at once and expect it all to work.
Thanks
MSD Parts List
I think this is everything. Most of these parts are available here at SBO, or Defender or WM.
--Vetus 5/8" vent (AB16B, $21)
https://www.vetusmarine.com/store/c/552-Stainless-Steel-Breather-Nipples.aspx
The angled one, so the hose can run straight along the hull and bulkhead (the straight vent would require the vent hose to loop outward where it might be in the way)
--Forespar Waste Deck Fill (907004, $18)
If you were down south in a lot of UV, you might use a stainless one instead. But 'marelon' is supposed to be UV stable, and for a summer-only boat here in the PNW, I'm totally fine with that.
--Raritan 1-1/2" Sani Fresh hose (Model: SFH, $13/foot)
I bought 5 feet; 4 might have been fine, but it would have been close.
I didn't take notes at the time, but Practical Sailor did some testing of sanitation hose a few years ago, and I believe this was the most flexible of the ones that did well in their tests.
--Trident Vac XHD 5/8" sanitation hose (148-058, $2/foot)
I bought 7 feet; again, 4 would be fine
--AWAB or ABA hose clamps, 2 for each hose
E.g.
https://shop.sailboatowners.com/prod.php?578, although perhaps SBO isn't carrying those anymore.
On further inspection, it appears I used cheap perforated clamps on the vent hose. Shame on me!
This isn't below the waterline, so I just used a single clamp on each end.
--Silicone grease for seals ($3)
https://smile.amazon.com/gp/product/B000DZFUPC/ref=oh_aui_search_asin_title?ie=UTF8&psc=1
The center of my vent is 3-1/2" below the center of the rub rail. That gave enough room for the flange on the smooth portion of the hull (below the bulge at the hull-deck joint).
Here's a closeup of the hoses routed up through the V-berth next to the bulkhead, in case that's helpful.
Good luck, and let us know how it goes!
One note on usage (content warning for the squeamish): I have no experience with a real marine head, but because the MSD unit uses less water, I suspect that it's harder to get it pumped clean. After an initial pump-out, I usually add water to the tank, through the deck fill (with the water hose most pump-outs have), and pump another few times. It seems like it takes another 2-3x to get a mostly clear pump-out. I'm not sure how important that is, but it seemed like it might help avoid sludge buildup (
@Peggie Hall HeadMistress might chime in and tell us).