Luis:
Go ahead and buy the CD if you wish to but, at the moment, unless you are planning on building one of the advanced "box of parts" type kits sold by Chambers, Track of the Wolf, Pecatonica River etc. I think it will be a waste of your money.
These CD's are aimed at building advanced projects, not building fairly simple factory kits.
If, after you have finished your pistol you still want to buy the CD then go for it.
I suspect that like many of us here have found after building a simple pistol kit, this first kit may be the "hook" that drags you into the world of muzzleloading gunsmithing. :rotf: