I can only relate my experience with VERY narrow center blocks from PB and the Fretwire...and add to that what I have read from other builders on this forum. YMMV, but I think it would be unwise to equate Warmoth kits with normal kits. I have my reservations about Warmoth, but a cheap body from them is more than the cost of most full kits.

I would not route on a semihollow from PB without taking some VERY careful measurements...which are hard to do through the F-hole. You don't have to do much of a search of the forum to encounter post holes that have broken through into the hollow space on the sides of the centerblock. I am personally 2 for 2 on this score, and that's just for the post hole, not for accommodating the full width of the TOM bridge.