Say WTF????????
It'll take a fair bit of work, including routing to get the body radius uniform.This job entails ALOT more than just sanding. As for the back, well your Vette has a fair bit of contouring for comfort, & to buggerize around with that might mean you'll get stuck with a less than usable bass, making it very hard to sell.
Dude, my advice is, if you wanna Thumb, buy a Thumb. Your Corvette balances better just the way it is.
There was a forum member who did loads of really silly mods to his Thumb, mainly just for the sake of it, rather than to give any real beneficial improvement. IMHO he ruined what was once a bass he dreamed of owning, for a long time. He even modded a guitar to look like a Thumb. Yes, he was THAT keen on owning one.
Please Glen, learn from this idiots many mistakes & trust that the bass you bought is the result of many MANY years of collective experience, & countless dollars in manpower & research & development.
I hope you take my advise as how I intended it, & that's with the best possible intentions & utmost respect.