Construction materials are mostly thick aluminum plate and cold rolled steel. If you can't find a couple of small 1 1/4" aluminum plates for the drill head and table support, you can cast then if you have a furnace and it will be good practice in setting cores. I have lots of small drill presses, so my preference would be for the option on page 4, I have lots of Dremel type tools and this would be perfect over the flimsy mounts they usually come with. Maybe after New Years if I feel energetic.
Check this out, enjoy.