I didn't know that about ram usage, I'll have to keep that in mind because I reloaded mods probably 3 times before testing. What's the limit in Terraria?
I'm running Calamity and Tremors and probably 20 other assorted mods with no issues so far.
So I'm assuming you shouldn't use the Hellevator builder while on top a house on top a floating island while having a mess of mods, but I wanted to test something. Here's the crash log, i'll post what mods I was using if you want later on.