enelram
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Yes, that's possible. The Columbine killers, IIRC, built their bombs in Eric Harris' bedroom and garage of his parent's home. I remember reading news stories about how they broke up glass with hammers, etc. for shrapnel. Apparently the parents didn't notice or thought they were working on some kind of hobby project.
http://www.newsweek.com/columbine-high-school-anatomy-massacre-166950
https://www.columbine-guide.com/columbine-bombs
So it's possible his roommates didn't realize what MAC was really doing.
If he didn't detonate any bombs in his yard, friends may have not noticed his tinkering was for bombs.
Or maybe they just looked the other way and ignored him.