Here are two custom Iron Man creations I worked on. I used the basic concepts used in the unofficial bootleg sets to start, then customized from there on out using official Legos. Most of the changes were to add stability to the models as well as increase the overall size. My goal was to build matching gantries using the same black, grey, transparent light blue color scheme as some custom Iron Man Hall of Armor creations others have posted online that I really liked. Thanks to the person who built and posted the MOC Hall of Armor using the black/trans LB color scheme as this is what inspired me to start building stuff other than official sets.
Iron Man 2 Gantry
Avengers Gantry
Hall of Armor
Thanks for looking.