hi,
if you want to go the ponoko route, i made a design with rounded buttons..
It can be a bit better as the button holes are a bit loo large for mine (~0.5mm, but it's still good enough) : the laser beam size must be included, so beware of that..
Fortunately, here is the svg file so you can modify it if needed :)
seq_enclosure_pvi_3.svg.zip
seq_enclosure_pvi_3b.svg.zip