finally dug up the answers. If you look at the POD X3 model handbook it lists them all 3 with the new name for the triple rec model.
The "Cali Diamondplate" is the same as the "Diamond Plate." They're both models of a 2001 Triple Rec, red/modern/bold/tube. (from the model packs handbook, rev D.)
The "Treadplate Dual" is a model of a 2001 Dual Rec 3 channel, red/modern/bold/tube. (from the PODxt manual, ver 2 rev H.)
The "Line 6 Treadplate" is a model of a '94 Dual Rec Tremoverb. (from the PODxt manual, ver 2 rev H.)
the "Line 6 Big Bottom" is a mix between a Triple Rec and a Rivera Los Lobottom sub rig. (from the model packs handbook, rev D.)
**** guitar rig, i just fell in love with POD farm 2. I spent 3 hours playing a triple rec at guitar center in houston this weekend, I own a dual rec 3 channel, and I been listening to a lot of make yourself/morning view/science (tremoverb combos). These models are money, SPOT ON, for the feel and character of each. Don't even need a boost neither! :lol: :lol: :lol: