The new RP-1 is great. I do think the first time you tool something it shouldn't influence the building time, since you have to produce all the tooling as well. Now it's just a case of tooling everything to get the building speed up.
I do have one issue: BDB engines seem to have a lot lower entry cost compared to other mods: for example the entry cost of a is given as LR89 is 142.000 from stock and FASA, but only 6000 from BDB. This is the case with all BDB parts.
I was wondering if anyone else is having this problem, or if this is a problem on my side.