now that has really puddled me 
,,,,,, sean how hard is the 4x lacing pattern ,,,,,,have you any pictures or reference to go by ,,,,,
and how much to send them to you mate 
It is really confusing until you get used to it the gay pensioner, took me a while. You should try lacing 9-speed or mountain bike wheels where you have to dish the things to ensure the correct chain line, amazingly confusing, I have only just started understanding it.
4x isn't any harder than 3x, I personally don't like 4x as the spokes don't sit as well IMO, the x (or cross) part of a 3x or 4x simply means how many other spokes an individual spoke crosses on its journey from the hub to the rim i.e 3 spokes (3x) or 4 spokes (4x), radial means 0x or the spoke goes straight from the hub to the rim.
These piccies may help.....
Radial (0 cross), only to be used on a front wheel.
Radial (0 cross) non-drive side and 3x drive side (rear wheel configuration)
3x
4x
