Pretty sweet! I decided not to go with the external wheels. The hardware I got from Lowes in the drawer pull/hardware section. These are what I used and they are getting Cerakoted...
http://www.lowes.com/pd_148248-37672-881671_4294856651+5003698_4294937087?productId=301 3888&Ns=p_product_price|1&pl=1¤tURL=/pl_$5%2B-%2B$10_4294856651 5003698_4294937087_?Ns=p_product_price|1
and the bolt:
http://www.lowes.com/pd_148300-37672-881667_0_?productId=3013901&Ntt=bronze+connecting+ bolt+furniture&Ntk=i_products&pl=1¤tURL=/pl__0__s?newSearch=true$Ntt=bronze connecting bolt furniture
Only drawback is I needed to shorten the bolts a little and I need at least one allen wrench to take it off if needed. Not a problem for me, there's one on my multi-tool that works fine. And once it's in place I don't need to take it off in the field.
Here's a crappy pic: