If I understand you correctly, yes, I could have. I thought about making a thumb hole stock and replacing the existing pistol grip--but that would have been a LOT more work so I went this route. There's someone on the Talon site that did that and then colored it in red. Not sure I like the red, but I do like the general idea. I just didn't want to go to that much effort. Yet. Maybe someday when I have the shop cleaned up enough to be easier to work in and I have a bunch of time on my hands.
(Like, THAT's ever likely to happen!)
The problem with this design is that it makes for a lot of distance between the table and the top of the scope. I'm not sure I like that. A thumb hole stock would solve that problem. Other than that I think I like it. But it's not for everyone.
The other problem is that it makes for a very heavy rifle! With the regulated HPA tank it's heavy, anyway. Even though the stock doesn't weigh much by itself it all adds up. Thank God for slings! Should make a pretty stable shooter, I guess. If I can hold it up long enough to pull the trigger.