Ellis Bot - CoreXY

See the new and improved V2: https://www.thingiverse.com/thing:2591848
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*** COMMENTS WELCOME ***

This is a printer I've been designing, which I've borrowed a couple things from the Hyper Cube Evolution. This will probably take a long time to gather the parts together, due to price, but I have some parts already. Things that are missing is a part cooler and which board to use.
More info:

Design Goals:
Minimum maxium speed of 100 mm/s (150 mm/s would be great, 300 would be awesome) with decent precission and accuracy.
350x350x500 build volume.
Extra space to make sure the carriage completly clears the bed.
100 Micron resolution

Features:
Core XY kinematics.
3030 based frame.
6mm thick aluminum bed
~~24V 350x350 mm silicone heater (300-325W)~~
120V 350x350 mm silicone heater
~~Polyurethane Steel Core 2GT belts.~~
Easier A&B belt tensioning (stolen from the Hyper Cube Evolution project).
Hiwin linear rails, becuase round