Police steel rim

Popo rallyes are made of much heavier gauge steel, I'm not sure it's a good idea to window a stock-style rim six times. I'm not certain what You meant by "built the round
holes", You mean the rims You want to mod have round holes in them now? Or are You calling the proposed slots "round holes"? Either way, I'm sure I can give You spes
for the slots, but again, I'd re-think doing that to a stock steelie. The wheel center-section is .210" thick material, very rigid stuff, I'd check Yours to see how it compares 1st.