Thinking about foamie with no curves

Sort of a followup to another thread, "Any body ever try a "dutch" door"? Planning a new (actually first) TTT. 6-8x12 with taper and sloped nose piece which will open for storage. For weight and other considerations am now looking at "foamie" construction, with no curves and a push up to, so it can be garaged. Am I thinking the right path or not. Have not completed my plans with "pencil cad" yet and fighting the uphill learning curve on Sketchup. Also trying to figure out how to use a two piece "dutch" door as my wife has medical problems and has trouble stooping down to get through a low (4-6) door, even though she is only 5-1. All ideas and constructive criticism welcome, since I am a definite newbie. 
