Nice work - totally worth the work to get it looking fresh again. Any quality carpet or rug store will be able to sell you jute underlayment. I used that in prior vehicles with solid results. On my 100 I've been using this (which is shockingly cheaper than quality jute from my local carpet stores these days....):
Under Carpet Lite is a superior sound decoupling material for those hard to cover areas like door liners, rear decks, headliners and more.
www.designengineering.com
Made in USA and when you call the company a stateside employee answers! Highly recommend them. Underlayment works great on the roof as well - just get some 3m spray adhesive.
For the center console metal bits, clean prime and rattlecan. For whatever reason they came bare metal from Mr. T and every one of those brackets in every truck probably has some level of rust at this point.