Their 7 strings were basically a bust because of the 25" or 28-5/8" scales and their insistence on routing for a questionable Floyd Rose copy long after the OFR7 was released. But 28-5/8" is just about right for 8 strings. They're a CNC operation, so the rest can't be that difficult. Is there any interest in a Warmoth 8-string? If their 7 string pricing is anything to go by, a basic alder body/maple neck combo would be around $500, maybe less. Throw in pickups, bridge, tuners, other hardware and electronics, and it'd probably come to around $900 for something with a fixed bridge, or $1000 with Kahler or Floyd.