Learning Sketchup

I've created my first sketchup drawing! My first attempt at designing a new mezzanine floor for our front bedroom. The bedroom has a fifteen foot ceiling, so it's begging to have something in that space. I reckon I can fit a platform big enough for a double bed in there. Sketchup has allowed my to prove that. Next, I'll think about tackling a narrowboat design. I've already produced two 2D plans of our proposed narrowboat in OpenOffice Draw. There are still some issues in my design : the fore deck and well deck are about four feet too short. Seating in the saloon is taking up an inordinate amount of space. I think moving to sketchup may be the answer. The problem is that having once gone 3D there may be no way to produce a 2D plan. I'd also like to transfer data from one application to the other. Oh well, only more experimentation will show what can be done.