James
I know weight is a big concern in making these rooftents. There is a tradeoff between comfort, weight and price. I have a medium sized Columbus and for grins I weighed the mattress, it was over 30 pounds, and it isn't as thick as the Maggiolina's. So you take a 115 pound Columbus and take out the mattress and it is like 80 - 85 pounds. Really advanced fiberglass tech.
The new carbon fiber tents are even more impressive. The shell is half the weight of the fiberglass tents, and the strength is off the chart. The mattress is the same weight though, still the comfort - weight tradeoff. The current mattress is a special polyurathane foam, which is good comfort for the buck and weight. I've toyed with idea of a composite mattress for my tent. Way to expensive to be commercially accepted but I think you can take out half the weight and increase the comfort. Start with a mesh boxspring, this is the anti-condensation mat that AutoHome sells. It is comfortable enough to sleep on alone but expensive about $150. Then on top of this a 1.5 inch layer of dense latex foam, grafted to another one inch or inch and a half layer of soft latex foam. This would make for about a three inch mattress that would be quite light but would crazy expensive, I figure about five to six hundred dollars again the weight - comfort - price tradeoff.
Of course there are ways to improve the Maggiolinas but I think Zifer does an excellent job building a tent that will suit most uses. From there you are always encouraged to improve on the basic tents. These shelf ideas are great.
Oh, and yes, a small Maggiolina is about 115 to 120 pounds, but feels like a lot more when you have it lifted over your head.
Rich