Y carriage with 3 point heatbed leveling

It is a Prusa, Mendel, RepRap type Y carriage with 3 point leveling of heatbed.
Needed things are shown on pictures + 4 LM8UU bearing + 8 pvc cable ties. If You use caps for LM8UU additional 16 M3 nuts and 16 M3x16 bolts are needed.
Source Autocad(2010 or higher version) file also uploaded for lasercuting.
Will make 1 or 2 next month.

The 2 holes behind the ones for my belt caps are compatible for this belt holder(big one), that can be used as belt tensioner - http://www.thingiverse.com/thing:552485

12.09.2015
Hi, again. Here are some updates. I made one of these. Added some new pictures.
First of all there was a mistake for the M6 bolts. They should be M6 x 60 mm, not 40 mm as shown on the picture. With a lot of luck and pushing you may use M6 x 50 mm.
The good thing is that it is very easy to level.
One of the bad ones is that You must have 530 mm movement of table on your Y axis or x 265 mm from its center. So it is not compatible with standart Prusas!!! They are too small. So youll lose a lot of print area on Y, if you use this thing. The other bad one is that youll lose at least 30 mm from your Z print area - it is inevitable. Me personaly dont have problem with this issue, dont know about you.

So Ill leave this design for my bigger Mendel type projects, also for my Delta and box type ones. Ill do my best to add another design, with 3 leveling points moved on sides, so they don`t mess with front-back movement and Y print area.

25.09.2015
Well, Ver 2 became whole Y axis system :)
Short video: https://youtu.be/0rnlMLoOqgU
Source file for it added.
Added build-in support for LM8UU caps /in case that anyone wants to use them/.
I think, that this is final version and won`t make any changes any more.