The bass amps are still there. It's up to you to select them. But just because they're modeled after famous bass amps doesn't mean they are the best choices for the music you want to play.
The Deluxe Reverb model sounds great with a Precision. For my ears. For the music I play.
So it all...
You're likely to be purchasing the entire guitar. Actually, many of the solid body guitars from Asia are likely to have agathis bodies.
Assuming, of course, that this is a solid body guitar. If it is a semi-hollow, a maple plug in the block would be perfectly acceptable.
Plug is preferred. Preferred, as in, don't use a dowel.
Agathis is a conifer (soft wood). The problem is finding a small piece of agathis. The cheapest thing to do would be to scour some swap meets or flea markets to pick up a trashed agathis solid body. Failing that, domestic softwood...
The room is more important than the amp. A square room is a bad dream for bass. A small, square room is a recurring nightmare that you never wake up from.
The amp you have is fine. Spend your money treating the room. Floor to ceiling bass traps in the corners is a good start.
Every change, such as removing the paint beneath a telecaster bridge will absolutely have an effect on the tone.
Whether or not that change can be measured with well calibrated sensors and computers, let alone the human ear, remains to be seen.
No one will hear it in the mix.
Ask a classical player. Or a bass player. It's all about the plucking hand.
There is probably nothing we can do with the fretting hand to affect tone except make a mistake stopping the string at the given fret. This is where the guitar is like the piano. Press and play. It is the other...
Boosting a frequency with EQ will not make up for a lack of instrumentation.
If you need to use EQ, the frequencies that will need to be boosted will be those that give the instrument increased clarity and definition so that it can occupy it's own space in the sonic mix. That is usually in the...