Ok, my cocktail cab actually looks like a cab now, not a collection of panels and boxes of parts.
Originally I hadn't planned to install feet, but then I found some small t-nuts (1/4 thread 5/16 shank), and eventually some feet to suit.
I test installed a nut onto a scrap piece of MDF, but as I pounded it in the edges started to spread (18mm laminated both sides). Second time around I drilled 2mm holes for the spikes, but to no avail.
My question to all:
1) Should I piss off the levellers and just felt the feet as it'll look better without them and be more stable (on a level floor)?
2) Or should I snip off all the spikes and just glue the nut in place around the shank and let gravity do the rest?
Picture of cab minus control panels below