Well, I like the way the Mendel90 is engineered. To me it overtakes the I3. Don't cut an acrylic frame. Acrylic is rubbish. Use the thicker mdf your laser is able to cut. The thicker, the better. The mobile parts needs to be light, but the fixed parts are better if they're heavy.
Collective intelligence emerges when a group of people work together effectively.
Prusa i3 Folger (A lot of the parts are wrong, boring !)