All looks good so far. I presume that you are upgrading the pickups. If so, then I'd rout the bridge pickup out a bit as the PBG routing is for a slightly smaller non-standard JB pickup. It's the rout in the maple top that you'll see, so that's the one that needs to be the most accurate. You can give yourself a little (Geddy) leeway here by making the cavity underneath a little bigger.

That 1/4" maple top is probably going to need some pre-bending to make it fit the curve, so you're going to need some heat or steam to help you do that, plus a suitable former.