Re: HSH, Series/Parallel wiring questions...
I can't say for certain if the original diagram is correct because I don't know how that 5 way switch works, but if it's just the stock ibanez switch it should be correct. You got the 4 conductor wires colors correct, so looks good.
With the push pull pots the two lugs with the blue jumper would be towards the bottom further away from the pot.
Make sure the true velvet you have is RWRP to remain humcancelling in pos 2 and 4 because I believe the wiring splits the humbuckers to the slug/north coil.
Also, when you have the humbuckers in parallel it'll no longer be humcancelling in pos 2 and 4 I believe