Dude, would be cheaper for you to find someone local, or even in the states due to shipping, perhaps Rywire or Chasebays.
As for time, you could manage a full wire tuck in 16 hours
Everything i learnt came from here
http://honda-tech.com/showthread.php?t=1693934&highlight=shaved+tucked+bay+thread
But i was reading long before that thread came about.
No need to lengthen anything at all, just get stuck in on a morning and see where you stand at tea time and dont rush or let it piss you off - you will be grand.
I have a couple of P28 (OBD1 D16Z6 and B16a) looms ready for tucked bays here, i will price shipping if you want, but it wont be cheap ontop of the £150 i charge for the loom