I wrote a reply without reading the actual thread saying you could do this using FOG, then realised that's what the OP is using.
I've used Fog for booting ISOs/software via PXE for a number of years and I've had Ubuntu Live, Parted Magic, Clonezilla, Acronis and more all booting via PXE.
http://www.fogproject.org/wiki/inde...Editing_.2F_Adding_3rd_party_software_support
I'm no expert but I've got a reasonable amount of experience with Fog if anyone is having any issues.
The original guide doesn't seem to be there any longer but for downloading ISOs to the Fog server in the past I've not used Winscp etc. I've found it much easier to use a wget from the terminal (wget
http://somewebsite.com/some.iso) or set-up a samba share on the Linux box to allow folder access via Windows. I normally edit the smb.conf by hand but there's a web based config tool which is much easier if you don't regularly use Linux
http://askubuntu.com/questions/196272/how-to-install-and-configure-swat-in-ubuntu-server-12-04
Its a brilliant resource once working and FOG itself is an excellent tool, although more suited for large scale desktop deployment is does have some nice features built in such as Memtest/Drive wiping etc.
I've even managed to get it running on a Raspberry Pi, although personally I'd just use a virtual machine even though it does work reasonably well on the Pi.
http://www.fogproject.org/forum/threads/fog-on-raspberry-pi.4068/#post-11088