GUI for Building WinPE
I find manually building WinPE to be a laborious task; so I decided to see if I could find something to make my life easier.
I found KAPE; it's not free but it is very cheap $99.
KAPE Builder | Simplifying custom WinPE environments
In fact they did me a deal (being an educational establishment) $99 for all of the freeware products.
Have a look at the reboot fourm, they used to be called boot-land.net but i think nike bought the domain off them. WinBuilder is a free GUI into building WinPE enviroments: WinBuilder - reboot.pro goes from a Win98 live CD to Win7PE.