Person/Outfit that will make cuben tent fly to replace sil?

Zpacks.

It's worth an email, with details and expected timeline.

I say Bearpaw would do it for you.

My first thought was Bearpaw as well.

Find a tent that someone already makes that's similar to yours

Too expensive to make a new design that's slightly different

MLD makes a bunch of Cuben mids that people seem to like, for example

someone posted a diy article here about one they made a couple years ago. It looked great.

I wouldnt trust it to just anyone. Since it doenst stretch, if not meticulously made, it could be dissapointing. The time it might take to get a one-off right would seem to make it prohibitively expensive unless diy. Once someone has patterns though for a certain tent, they could crank them easier.

What tent are you looking to have a cuben fly made for?

Dan Durston made a cuben tent fly some years ago. Maybe you could make your own:

http://www.backpackinglight.com/cgi-bin/backpackinglight/forums/thread_display.html?forum_thread_id=34135

I think the price to have one made would be so prohibitively high (plus the risk that it might not turn out well), that it would be better to just buy a new cuben tent.