I hope this is OK to post, if it was "insider information" I would imagine it wouldn't be mentioned. I recently emailed Goruck with the very unlikely question, "I'm wondering if it would be possible to pay a premium to add the bottom MOLLE to a ruck?" knowing it was extremely unlikely but the response was exciting:

"Thank you for your question. We are not set up to do customizations yet, but we are developing a modification program through our SCARS facility that should be running later this year."

Basically I want a 40L GR2 (GR3 is too big for my use) with the bottom MOLLE for the Tough Bag but obviously that's not offered. It sounds like it potentially may be possible in the future via whatever modification program Goruck has planned.