Tolex is the most commonly used covering material (the vinyl type material as used on Marshall and Vox amps) or alternatively the tweed type of material as used on early Fender amps although that is a bit more challenging to get good results with so probably not the best choice for a first project. There is a selection of covering materials (and grille cloths) here
https://www.allparts.uk.com/collecti...gs-grill-cloth or searching eBay for "tolex" should throw up a few results.
I would recommend covering the whole cabinet after putting it together for the best results, it's not particularly difficult once you get the hang of it and some metal corner protectors can hide a multitude of sins on the corners
![Wink](../images/smilies/wink.gif)
. Some good info on how to do it here
http://guitarkitbuilder.com/how-appl...ifier-cabinet/