IMO, you could do worse.
This kit is made by Investarms/Italy and looks to be the same gun Cabela's calls "The Traditional Hawken Rifle".
It is, of course no where close to a Hawken rifle but I've read several posts which said it shot well and for the price, is a good gun.
It has a 1:48 twist barrel with .010 deep rifling grooves which should shoot short lead bullets or patched balls well.
The stock, being walnut should give you a much nicer looking stock than some of the strange white woods that the Spanish guns are stocked with. (I never have figured out what that wood the old CVA's were stocked with is. It is not Maple. It's wierd.)
If your ordering from Dixie, you might want to make part number PK0519 an option to the kit number you mentioned.
It is the same gun in .54 caliber.
It's been my experiance the .54 caliber guns tend to be more forgiving. That is to say, they will accept a wide variation in powder loads and still be very accurate.
Shooting a .530 diameter roundball with a .015 to .018 patch with a powder load of 60-120 grains produces excellent accuracy in my .54's and is powerful enough to take any big game available in the US.