In this custom I do with Ultimate Captain America and a little paint in boots, change gloves whit capi series I.

for IronMan used the hasbro ultimate IronMan gloves form IronMan face off and extend little bit the legs with shoes of another fig. that don't remeber if ciclops or magneto, dry brush for metalic finish.

and for ultimate Thor the body of sabre tooth, hands of hercules and head of a lose wwf figure.

I do this custom about 1 year ago.