That is a shame that the fee model for 3D printing doesn't promote good design. Low infill is vastly superior to shelled parts. I personally design with the simplest part that does the job and throw the volume to the wind. I would propose that you model it the way that you think it should be and then see if you can get a community member to partner up with you on the printing.
Unless you need dual extruders, the Azteeg X1, PrintrBoard, or RAMPS should all be about as easy to use. The more expensive ones will actually add a small layer of complexity. (More possibilities for putting wires in the wrong spot and for setting to get wrong in the firmware.)
I will eventually get around to the Jumbo Simpson. We are also cranking on the a Jumbo Wally. As far as leveling goes, I plan on using software leveling at the time of use. (The Jumbo Simpson I am planning is collapsible so you can easily store it in a corner of a garage meaning leveling has to be redone for each use.) For FDM with a 1.75mm nozzle we only have to get the layer right to +/-1mm. I am sure we can do better than that.
Unless you need dual extruders, the Azteeg X1, PrintrBoard, or RAMPS should all be about as easy to use. The more expensive ones will actually add a small layer of complexity. (More possibilities for putting wires in the wrong spot and for setting to get wrong in the firmware.)
I will eventually get around to the Jumbo Simpson. We are also cranking on the a Jumbo Wally. As far as leveling goes, I plan on using software leveling at the time of use. (The Jumbo Simpson I am planning is collapsible so you can easily store it in a corner of a garage meaning leveling has to be redone for each use.) For FDM with a 1.75mm nozzle we only have to get the layer right to +/-1mm. I am sure we can do better than that.