MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
A slight variation of SonnyDR's design (http://www.thingiverse.com/thing:1091510). I like how you got the starting point on the motor mount lower. That will save some room on tall prints. Nice work. I like your part fans as well.
If you want to avoid attaching the chain to the printer lid, you could try my hole cover and accessory for dropping the chain right to the printer deck. That will keep from having to remove anything from the printer lid when you remove it. The use of 3M strip is better than drilling and bolting though. http://www.thingiverse.com/thing:1105170