good printers but not that large a print area.
Instead have alook at the formbot t-rex/raptor.
http://www.formbot3d.com/formbot-rap...ing_p0022.html

The raptor is a tad overbudget, but with a build volume approx 10x that of the prusa - a much better investment for larger prints.
The fewer tiles you need to glue together the stronger and more durable the roof will be.

Forget abs. It's crap unless printed in a heated build environment - and even then, where fdm is concerned, pla is always better. Pet-g is pretty good, cheap and once you've dialled it in (can be tricky) extremely tough.
But spend some more money and use ninjatek's armadillo polyurethane filament and you should end up with something as light and tough as the carbon fibre job.

There are a lot of premium filaments around these days - most people never try them and still only think of abs, pla and pet-g, I've tried most and the armadillo is as good as ninjatek say it is. Plus really easy to print with. Also uv and chemical resistant.