FrenzyRumble can be found at TFW2005, and FrenzyRumble.com. And that Jetfire is actually one of his less-impressive customs---there are some AMAZING things he's done. Namely Leader Prime--repainted ALL of it. Even the flames, from scratch, to be more accurate. And chromed it. Also be sure to see his custom Menasor--yes, it combines, yes each one still has a robot and car mode.
I think he's "beyond backlogged" with commissions---best bet is to watch ebay---he ebays a lot of his work.
:;edit:: Here's Menasor: http://www.tfw2005.com/boards/radicons-cus...word-added.html
http://www.tfw2005.com/boards/radicons-cus...-wildrider.html
http://www.tfw2005.com/boards/radicons-cus...ler-9-11-a.html
And here's Defensor: http://www.tfw2005.com/boards/radicons-cus...part-6-6-a.html
http://www.tfw2005.com/boards/radicons-cus...obot-group.html