omgiv, neat looking little drill press! I think this, coupled with your vise and cross-slide vise should "gitter done"! What I have done is machined an aluminum bar which I can clamp the case to and then clamp the bar in the vise but this is just to make the setup quicker and simpler.
As a general rule of thumb the smaller the drill the higher the rpm as cutting speed is calculated as Surface Feet/Minute, the surface being the drill bit outer edge. Here's something from the web that pretty much matches my books:
Drilling Speed in rpm = (CS x 4) / dia
where CS = cutting speed in sfm = 300 for aluminum, 120 for brass and bronze, 90 for low carbon steel, 70 for cast iron, and 50 for alloy steel.
So ballpark speed for a .079" bit in alloy steel would be (50x4)/.079 = 2531 RPM. If you drill too slow with a small bit it may "grab" and snap - major PITA if you're 3/4 done and then snap off a bit, DAMHIK!
Use plenty of cutting oil and not too light a cut so you don't burnish or work-harden the stainless. CN cases are a crap-shoot - one will drill like butter while the next might take a bit per hole! If you can afford carbide bits you shouldn't have any problems.