I know of a number of companies who are building boards that break out the SAM's on-chip Ethernet, and use one of the many unused on-chip SPI buses. Some of these sit over the chip itself (and have shield pass-thru so you can put shields on top of them), and some are replacements for the Due entirely (eg: using the on-board components yet keeping the Due shield pin out).
I've posted about many issues with the RAMPS design that need to be changed (many of these are changed on the RAMBo all-in-one design, but not all) that IMO are definitely worth having a look at. My specific pet peeve are the PTC fuses (they're useless and actually dangerous, especially when over their voltage and/or current range). The layout of some of the connectors can be an annoyance too (eg: just slightly too small clearance between some of them, such between Power and D8), and the cramped board style.
I've posted about many issues with the RAMPS design that need to be changed (many of these are changed on the RAMBo all-in-one design, but not all) that IMO are definitely worth having a look at. My specific pet peeve are the PTC fuses (they're useless and actually dangerous, especially when over their voltage and/or current range). The layout of some of the connectors can be an annoyance too (eg: just slightly too small clearance between some of them, such between Power and D8), and the cramped board style.