A couple of you guys contacted me, so I figured I come over and see if we can figure out what you need. I have no experience with the Virgin, so you guys will need to bear with me. Because no one seems to know if you need a flipped or an unflipped cable, let me suggest this until someone figures it out and tells me.
I'll build a short cable that can be used both ways, flipped and unflipped. I'll put a double connector on one end. For flipped plug one or the other of the double connectors into the motherboard. For unflipped, plug the middle two rows of the double connector onto the motherboard. You can do a similar thing with the 2.5" drive, but backwards (believe it or not). You guys will need to figure out how long the cables need to be.
For the 2.5" to 3.5" adapter assembly with double connectors at one end would be $17.50 for the standard setup. Internal custom cables are done by the foot and # of connectors. My supplier just raised my cable prices (yea likely story) so as of tomorrow cables are $2 a foot, or any part of a foot, and $2.50 a connector. I also need $4 shipping per order, no matter how much you order.
In case you don't follow what the double connector does, it is just an easy way to swap the top & bottom rows without switching every other wire. This means that a "flipped" cable for one drive needs 3 connectors and not 2. With any luck you won't need "flipped" cables, but the nice thing about the double connectors is they work both ways.