These recipes require you to have a base crossbow in your inventory to show up, to prevent clutter in the smithing screen.
You DO NOT need this if you are using my other mod - Legendary Skyrim Crossbows Highly unique crossbows have been added that were designed using vanilla textures (Daedric, Dragonbone, Ebony, Elven, Glass, Iron, Nordic, Orcish, and Stalhrim) they way these crossbows have been designed they will show the effects of custom textures you have installed. (The Drunken Huntsman in Whiterun and The Castle Fletcher in Solitude) The new crossbows are fully spread through the leveled lists and you will now find them being used by the denizens of Skyirm and being sold by specialty archery vendors. This is done by fully integrating crossbows into every aspect of Skyrim, following all vanilla standards (leveling, balancing, etc.), and removing all traces that they were ever exclusive to the Dawnguard.
This mod aims to make crossbows a standard part of Skyrim, not an exclusive weapon of the Dawnguard.