Yeah i know it's a short tenon never said other wise just that it looks like the routed out the tenon. all my other Lps with short tenon don't look like this one does. there is no outline where the neck is set into the body where as the custom does..
The offset on yours is odd.
My Custom and the '59s in this thread, the tenon is centered and maybe 1/2" narrower than the fingerboard. Yours looks offset and about 1/4" wider, like the cut on the Solo kits.