I haven't come across local kits, but there are plenty of folk with routers who can help produce the bits.
A variant on the collapsible idea: you can make the UTA ultralight (eg a single upper ring, like the Bartels designs). Then the balance point moves down the tube, & the rocker box can be ultra low profile. As can the mirror box - or just remove it entirely, as per Greg Babcock's scopes. These ideas have found their way into the Obsession Ultra Compact.
Phil