Chamber's Lancaster "kit" is one of the best designed, most complete, most forgiving "kits" out there. I've probably built a dozen.
If you continue the way you're going, you can have a very nice rifle to call your own, with great architecture in the Lancaster style. It just doesn't get better than this. Take your time, measure twice, cut once, don't try to get to fancy on the first one, and you'll have a gun to be proud of.
Remember, a plain rifle build, well executed is a thing of beauty. BUT, it doesn't take too much deviation, (i.e. out of place and style, carving, engraving, etc.) to turn that $1000 "kit" into a $500 rifle.
Good luck, from the looks of things so far, you'll be just fine.
IMHO, next time, pin the rear of the triggerguard, instead of a screw.