CVA quit importing all sidelock guns a few years ago. That includes their sidelock kits.
They were buying their guns and kits from Ardesa in Spain. Likewise, Traditions buys their sidelock guns from Ardesa so you could say they are now importing the guns CVA used to import.
There are undoubtedly still a lot of old CVA kits owned by folks who never got around to putting them together but finding them is not easy.
The Traditions kits have all of the old CVA traits, ie, low cost and questionable quality of their locks.
The Spanish guns also use wood that is rather hard to stain.
The Lyman kits are imported from Italy and are usually of a higher quality but a higher price to go along with it.
The Lyman guns usually use European Walnut for their gunstocks which require no stain, just sanding and finishing oils.
All of these large factory kits are basically production gun parts that are basically finished except for the final sanding, shaping and finishing steps.
The metal parts usually require a bit of finishing and the stocks wood will need to be sanded down to match them.
Applying a wood finish is fairly easy, even for a novice. Applying the barrel finish can vary from giving it a fast browning using Plum Brown or a slow browning using one of the solutions like Laurel Mountain Forge makes.
Actually, if you have a very humid room like a bathroom with a shower the cold browning method is quite easy. It does take a few days though.
Other barrel finishes can range from leaving it "in the white" where nothing is done to using a instant cold bluing like Birchwoods Purma Blue to using yellow mustard or vinegar or Naval Jelly to produce various gray colors. It's up to you.