You are welcome
In all actuality, the mini doors on the front can be zip tied, not a problem. I purchased the HQ Lrg Sturdy from Suncoast and that has six mini doors (or as I usually call windows) that are zip tied. I understand you are working within a budget and if that second cage fall into your budget then I really think it's the safest way to go for now.
My Lrg Sturdy came with zip ties to use but they can be picked up cheap practically anywhere. I ended up switching mine out for the reusable kind.