"If it wasn't for the Protocraft flextrack and the prebuilt turnouts you wouldn't see me going there. It's picky, no doubt about that."
I wouldn't worry about the flange size if you really want to go with P48. HO trains run fine with flanges about the same size as P48 and N trains run just as well on even smaller flanges, and those scales do it with less mass which means less tracking downforce. I think the small flange problem is mostly a myth passed along by those who've never tried it and it's certainly nothing that a little care in track laying can't eliminate. For those starting a new layout the only real downside to P48 is the extra cost it takes to replace all the wheels on a large fleet of equipment, you end up paying twice for the wheel sets and P48 wheels sell at a premium to O wheels so it's not possible to come out even by selling your O gauged wheels. Protocraft flextrack would save a lot of hand lay time and labor but I'd build my own turnouts since commercial ones cost a lot more than the materials it takes to build one. Hand laying 3 feet of track won't save you much over buying flextrack but hand laying one foot of turnout will save you plenty . If you doubt your turnout building skills and want the best reliability you can solder the turnout rails to PC board ties spaced every 4th tie or so then nothing can move out of gauge, the wooden ties are just along for the ride :> .....DaveB