Would the SD SH-4 be good for Thrash Metal solos if it was in the neck position? Body wood is mahogany .
Why is that?
Because the JB is ridiculously bright and high output, and barely sounds good in the bridge position, let alone the neck. It would overpower whatever else you put in the bridge, and when it comes right down to it, just wouldn't sound good. It would be very shrill and piercing.
In thrash, you don't use a neck position.