With the current release of GWs new Knight codex I digged out my Knights and took some pics.
Ferrum Rex, Questoris Knight Magaera of House Hermetika
Magaera type Knights are most often used as shock assault units, breaching the most heavily defended enemy positions, while shrugging off heavy weapons fire and self-repairing even devastating weapon strikes in a few minutes. To aid in this role it is armed with a complex lightning cannon, using focussed electro-magnetic beams to vaporise infantry and blast apart armour.
Ixion - Knight Paladin of House Hermetika
I used transfer of the original kit and some Forge World sheets, the heraldry on the Ion shield is partly freehand painted (the flames) as is the Hermetika symbol on the right shoulder.
more pics on my site:
http://www.adpublishing.de/html/adeptus_mechanicus.html