Audio System help

Hi guys.. Im new to the forum and have been reading up. I have a 2018 Tacoma Double Cab and Im in the process of up grading the stereo system. Im not an audiophile just a diyer that wants better sound. Ive already upgraded the tweeters with the subaru kickers. Now Im planning on upgrading the rest. Here is what I have in mind:

Kenwood Excelon DDX8905S - HU
iDatalink

$180 Maestro ADS-MRR Universal Radio Replacement and Steering Wheel Interface

Maestro ADS-MRR Interface Module - To maintain all steering wheel control functions
Kicker 44KSC6904 - Front doors
Kicker 44KSC6704 - Rear doors
Rockford Fosgate T400X4ad Power Amp
Plan to run all new 16 gauge speaker wire
8 gauge power and ground wire for amp
RCAs from HU to amp
Sound deadening in all doors
No plans on a sub

My questions are:
1. Do these components seem reasonable?
2. Is there anything else I should consider or Im missing?
3. Can I run the power wire for the amp next to speaker wires? Plan to run both along the door sill with amp installed under driver seat.
4. Plan to wire the tweeters to the front door speakers in parallel? Would that be the best way?
5. What is the best way to secure the amp fuse next to the battery?

I appreciate any help you guys could provide!