Looked at doing ball bearing runners, and I managed to find 550mm at $8 per set from Trads Trading but travel time as about 2hrs so I didn't make the call to check stock, was looking at $8 a pair from them which I was impressed about.
Screwing info for those into it.
1. The faces frames 40x 32 mm
2. The sides 40 x 32 mm 
3. Conventional countersunk that hold the frame together:- 16 x 50 mm
4. Conventional countersunk that hold the slide mounts on 32 x 30 mm
5. Kreg SPS C for the drawer frame and bases 192 x 19 mm.
6. Frame rails little tiddlers qty 48 x 20 mm.
So I have blown close to another $50 bucks!
I did I get a palm blister and RSI from  it all?...yes I did but I am not showing you a picture.
Domino ...well keep me in mind (but don't let on to the F$ haters please, get enough nasty mail as it is)

Regards Rob