I believe I just completed the Iron badge!
It's rather sad that in total I've done 33 oddball submissions and that since the last one got me so far over the finish line, I didn't really have to do 30 of the 33.
To make this certification easier, it takes a grand total of 1250 oddball points to earn the Iron level. 5 for Sand, 35 for
Wood, 180 for Iron and 1030 for Iron. The following three BBs earned exactly 1250:
Greenhouse - 850 points
Basement stairs - 40 points
Cabin - 360 points