Hey Arnim Zola..sorry for the delay in reply.... The sets Willy's using are the Batman mansion/cave, The Spidy 3 new Goblin lab, The FF4 Baxter Building Lab, Alien Legacy The Arrival (big building they're messing with Hulk in), The Spidy vs Venom set, the Spidy/Green Goblin Camera shop, Spidy ns Doc Ock subway car set, , the Spidy 3 Sandman Bank Heist, and various "bit's and bites" ( mmm... bbq, or cheddar) from other MegaBloks kits.
Somewhere in the PBucket shots you can see the Alien Legacy set assembled on our freezer the way it was intended, before we tore it down, and "customized it into the 2 story Minimate heart of a city block. Should get him to do specific "team" action shots in the city, but he likes to stage epic "everyone in the MU" battles even if it includes 15 Spidys, and 10 Logans... who am I to question a 9 yr old fertile imagination?!?