Yeah, it has indeed been a while and updates have surely been made, but I wanted to update only when the engine was running. However that is not the case yet, even though I feel I am close. Main thing to assemble and make will be the distribution, for which I should have most parts as well already:

Its actually an older picture with an empty case, apart from a dummy 1700 crank to mount the belt drive on.
Cams have been made, but sorry, I don't want, nor see the relevance to give specifics on costs. I am sure you being in the US (guesstimate) there are enough companies that can do that. Furthermore, the likelyness of you needing also custom cams for a OHC boxer project seem slim to me, so the relevance seems small, to me anyways.
What also holds me back is the unwanted social media discussions that could cause this and which I don't need: case in point: The camshaft company I used had a 'influencer' visit them and he saw my heads there on the bench. Of course he could not resist taking pictures and publish that in a reel in FB, which generated all kinds of remarks and suggestions online. So I am sorry, but I don't mention names let alone costs (to also protect those companies) of parties of companies I use.
Hope you understand.
On the positive side

I am trying to revive the old website, where I can give and show some more info and history of the project, for thiose not using FB.
I contacted one of those younger generation blokes who lives nearby and who said he could build that. So far not yet, he seems to need to train himself first in WP as thats what my hosting provider uses, LOL