Create floor plan in Powerpoint

We're moving our office. I need a floor plan for our current space and another for the new space. For our current space I only know the total square footage of each of the five rooms that comprise the space - we'll have to guess at the length of each side. For the new space I have a detailed PDF to scale and a DWG file. If you can't use DWG you'll have to work out the length of each wall in the attached PDF. There are 25 people in the company and the desks are approximately 5 feet by 2.5 feet. I need: 1) A Powerpoint representation of the current space, with individual desks (or desk/chair combos) and a few pieces of furniture. 2) A Powerpoint representation of the new space with the same desks and furniture. I'm asking for this in Powerpoint because then I can easily manipulate it myself. It's OK if it's in another program, but I have to be able to use that program. Please expect a revision or two before the project is complete. We'll likely forget something in the first round. I'd very much like this done within 24 hours.