pillar drill?

[Hobgoblin]

might be better with a band saw wilfy for your box section, but the accuracy of such might be lost a little.

I find an old tap is as good as any centre punch, so long as it has a pointy end. others may disagreee and say that they shatter but ive never had this happen.

The pillar drill should be fine so long as you take your time, perhaps double drill your holes, pilot then main size.

for marking out, try a cheap digital vernier caliper, an engineers square and some good old marking out blue dye.

The drill you have posted seems at a good price and at a budget would be ok for light work, up to and including what you want to use it for. So long as you have some cutting fluid to lubricate the drill, and PECK (go in 3mm come out, repeat, repeat, add fluid, repeat) drill you should be fine, remember to run the drills at an appropriate speed and feed too.