Copy time or cost probably should be changed - I think copy time is the big outlier here. You have some idea of how many of these structures you expect will exist but my guess is a few dozen at most in the first year. You shouldn't be able to make many more bpcs than structures intended to be deployed. You need a bpc market of course - not every null alliance can be expected to put up 700b to get their foot in the door - but you've got to have it so the bpcs any one bpo can produce are some fraction of expected demand. With a base build time of 30 days, I'd set copy time to at least 30 days and probably much more - unlike supercapitals, there is no need for you to copy this bpo to produce with it safely. You can produce in-station off the bpo itself so copy time can be a freebie for when the bpo is not in use and can be longer than the production time, even several multiples of it without it being a big problem for the market.

The bpo cost of these is 10x what a titan bpo costs, the bpc copy time is ~1/6th of a titan bpo copy time, and most titan bpcs are pretty cheap. Leviathans are the only one where the bpo isn't glutted but even those run only 1-2b each.

I'd probably make it a several month base copy time so that you get people buying the bpos initially so they can get a leg up on deploying them and use of the bpo is tilted more towards manufacturing than copying. At a minimum producing them and copying them should be roughly the same time or at a minimum at the ratio of t2 bpos. Copying in 1/6th of the time to build it seems way, way off.