Balrog the Clown
Caleidah
As far as an Adeptus Mechanicus army list goes, there are a lot of codices that have been made over time, one of which is currently sitting on my desktop for some heavy inspection (again). My local Game Shop has looked over it and I'm going to help put together a 3k "expeditionary force" of Ad Mech that they're going to keep as a store army and for use in Apocalypse.
If you so desire it, I could email it to you.What did you use for the conversion? Or did you find some Forgeworld models...? (I could swear Forgeworld has Ad Mech models...)
The only Adeptus Mechanicus models they have is most likely enginseers, I belive you might be thinking of the models that Hotwerth is selling on Micro-art studios.
He made the first ones for his own ad mech army which can be found here.
http://www.shop.microartstudio.com/iron-brotherhood-http05-p-147.html
And also made some "rough riders" which can be found here.
http://www.shop.microartstudio.com/iron-brotherhood-ltru02-p-172.html
He also have other models with wings now, could easily be converted into something else which can also be found on the site.
Here is thumbnails on his ad mech army, click on them to see the whole force.
http://www.hortwerth.com/My_own_projects/index.html
Hope it might give ya gitz some ideas or urges to buy them, gotta try to give him more customers after commissioning me my Flash Gitz. ;D