I'm starting to see some buzz about standing desks emerging, from the DIY realm definitely outside of the interiors and contract design circles.
All I can say is there are some great companies that have you covered here, and you'd be best served by a truly adjustable stand up desk over a coffee table stacked on a folding table. I know, real office furniture is expensive, but you are worth it. Anthro Carts has you covered. BioMorph has been doing this for years and probably has the best range of task tables that will stand with you.