http://survivethedistance.com/forums/viewtopic.php?f=5&t=1434&p=11324#p11324
This includes those nitronic assets, Not made by me.

UPDATE:
Added in Nitronic buildings and more custom objects!
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Custom made objects. :D
I have saved most of mine in the rar in the link on the page for you to use how you wish. ;)
I just ask that you leave a credit for me in your level descriptions. :)

Some of these objects are from Nitronic rush that the devs have put in and i nabbed them;)
Like the Nitronic Checkpoint and Nitronic Lamp

Glitches may occur or the objects themselves may not even show up. Fair warning!!