I thought he made a non-reverse tbird model,but i didn't see it on the website. Maybe a custom one -off? The tbird pups are well written- up over on talkbass.
If I weren't so convinced that part of what makes P Bass tone so bright and snappy like a Ric is the fact that it is, essentially, running off of one single coil, I'd really be intrigued by the PT4 with its humbucker. I would never want to give up the single coil nature of the tone if I could help it.
I really like Thunderbirds for the most part but don't they sound a bit dark sometimes? I wonder if his pickups are any better about this. I respect Mike Lull though, and if were going to get a "boutique" P, it'd probably be from him.
today i'm finding old threads i missed previously-from what i have read,Mike is basing the new pickup design on the old 60's model t-bird pickups,which while humbucking,had a great clear top end to them. i owned a 67 epiphone embassy for several years before i sold it for crazy money,and the pickups in that bass were probably the best sounding pickups i have ever heard. the closest thing to them in the "meat" department has been the hb-1's ,again,if the new lull pickups are anything close to the old gibsons,they should be killer.