Hey Folks need a bit of advice

Building a compact 1x12 speaker cabinet out of an old combo amp.

My amp heads that i would like to use on it are a Marshall AVT150 (for rock music) and a Crate powerblock (for acoustic gigs).

Now, Im needing advice on what the best speaker to use for this project is, and also where can i get the necessary parts from (speaker, wire, input jack etc).

PLUS im looking for suggestions on what material to use to customise the cabinet. Best suggestion so far is Denim with pockets for my plectrums/ slides etc lol.