on most of these guns the plates were inletted, on the kits the inlets were often but not always roughed out...depending on mfg, style and just how much work (how rough a piece it is) was involved in finishing the stock..some came with just a block of wood with a channle cut in it...other's just required a smiple sand or even minor wood carving to create the finished piece...but I'm quite sure that the plates need to be inletted and are supposed to be flush...
as seen in these pictures:

Frigging site will only let me upload 1 pic at a time