I've been pondering buying a stock double neck guitar and retrofitting a shortscale bass neck on top. I'm thinking that this would only entail adjusting the neck pocket to fit, routing and wiring bass pickups as necessary, installing a bridge (and possibly ferrules for string through), and making/buying a custom pickguard to cover the remains of the old bridge attachment. Any factors I am failing to consider?
Rather than buying all the parts and finishing/building from scratch, I think this would be the best option for me because I have limited access to tools and workshop space.
I realllllllllly wanted to use this as the basis: Agile TC-630

but they only sell it in checker now.

Suggestions as to other models/brands I should look in to?