Hey Peter,
I have built quite a few custom rods both for myself and for others.
If this is your first time, I recommend getting a kit that has everything you need. (blank, guides, handle assembly, epoxy, etc).
Once you get the hang of it after a rod or two, then you can custom order parts to build a rod to your liking.
Good luck, and be sure to post the process/results!
Cheers,
*Stoty