I figured that this was probably the case. But what you need is a "how to" book or video on the skills and tools, not a set of plans... unless the plans come with such a book or video.
What you likely would be best off with is a rough shaped stock and then work out the recesses for the parts that you have. Or if you really want to jump into the deep end with bricks on both feet then I'd strongly suggest learning your steps with a hunk of cheap building lumber first as a training and teaching aid as I suggested already. Make all your mistakes and learn on a buck fiddy's worth of wood instead of a $150 blank of flamed maple. You can thank me later.
Even if you already have some cabinet making or other wood working skills working on the methods for inletting barrels and actions and matching cast butt plates and patch boxes in a really clean manner will take you to a whole new level. I know this has been the case for me and I've got a pretty good background in classic wood working to where hand cutting dovetails doesn't fill me with dread.
Look up the Midway USA channel on You Tube. Larry has a number of videos on working stocks for inletting. They are mostly about cartridge guns but the skills and tricks he uses are timeless and apply to any stock work from any period of firearms. They tend to be pretty short but they are filled with information if you can read between the lines a little. His tricks for marking using lamp blacking are seriously handy. I've only used a candle myself because I didn't want the soot that comes from a serious oil lamp burning with a tall wick. The candle blackening is a little slower but works just as well.