Here guys, no more windows BS.
https://github.com/Alex-Kw/gnet-imager/blob/master/gnetflash
contribute if you want!
In all seriousness it's just a wrapper for the linux tool 'dd'. if you have a 1 hard drive laptop, you can install ubuntu on, this script would let you copy the raw game images quite easily. It's exactly how I do it in my own test setups, using lubuntu and a USB > CF adapter.
Also, located here, are exact copy's of all the mame CHD's, but extracted to raw already:
http://neohyphengeo.com/GNET/
Mods if you don't want that link here just remove it and/or let me know. I hope with this script and these extracted CHDs available, anyone can make these themselves. I recommend Cisco CF cards or other small capacity industrial type card. (Edit... Mixed luck with Cisco cards recently, GNET didn't like a lot of the 64MB ones, but 128s I've had better luck).
a 64 or 128MB card is enough to hold any one game at a time.
I hope, someone can find a way, to "bank switch" or similar a larger CF device, to create a lazy man's multigame. I have not been able to find a good/easy way to do that yet.