I have only done a 1x12 cab and that was relatively easy. I have a nice piece that would easily do both my Deluxes but have not, and may not, do the mod.
If I did I would get a new baffle, carefully take the amp apart, install or get an upholsterer to install the tie dye, reassemble amp.
Baffle source:http://www.mojotone.com/Cabinets_x/Baff ... ead-Baffle
Damn, now you have me thinking about it again...