do have the stl files or the kit available?

I no longer have any kits. 

The STLs are on thingiverse from Jon Lawrence

http://www.thingiverse.com/iamjonlawrence/about

Full set of pictures here http://imgur.com/a/FTdbU

This is an upgrade kit for your Printrbot Simple Maker Edition 1405. It comes with the hardware needed to upgrade to Jon Lawrence's extended Y axis http://www.thingiverse.com/thing:372467 and his extended X http://www.thingiverse.com/thing:383713. The idea is you can get all the rods, acme screw, bed, nuts and bolt. All you have to do is print your own parts from him bill of material. Since there are 3 parts in the X axis upgrade that you CANNOT print on the stock 4x4x4 print area, I have printed those and will include them in the kit.
The Kit includes:
4x 8mm Smooth Rods 495mm
2x 8mm Smooth Rods 406mm
1x Acme screw 450mm
1x 14.5x9 (12x8 buildable) Aluminum Bed
1x 3D Printed Black Bearing Plate
2x 3D Printed Black Beefier Bed rails (the stock arms did not seem strong enough) http://www.thingiverse.com/thing:520696
7x 607 Bearings for double or single precision setup, your choice.
1x X-axis endtop extension cable
2x rocker switches to wire up on/off or fans
2x 2m long GT2 belts
All nuts, bolts, zipties, and a bag of spares.
Price is $150 +$20 shipping in the lower 48 states. Contact me for shipping outside of that area.
I currently have 2 kits ready to ship.
There is an option to have me print the whole BOM for JL's X & Y upgrade for an additional $25. This will take a little longer to ship as they'll be printed upon ordering.
Message me if interest.
Note: I have one kit with glow-in-the-dark 3D printed bed rails and motor bearing plate. I consider it the special edition.