Do you plan to offer lower-end OnMetal nodes? For example, 16 GB of RAM, a quad-core Xeon E3 processor, and a 256 GB SSD? Presumably you could put several such nodes in one chassis to make that kind of configuration economical.
As a general principle we will add more form factors.
For your specific example hardware, that kind of specification could be achieved using the Open Compute Micro Servers / Server Card designs, instead of the full-on 2 processor windmill designs:
http://www.opencompute.org/assets/motherboardandserverdesign...
As you make smaller servers, things like HA-Networking become a higher portion of the cost too, so it might be more feasible if we dropped the 2x10g Bond and went to a single 10g port for example, would losing the HA networking but having those kinds of specs be interesting to you?