This mod seems quite similar to https://mods.factorio.com/mod/blueprint-sandboxes .
What are the main differences between that and your implementation?
I saw that your mod has a "stop time in background" functionality and a multi "sheet" design, which seems interesting, but I'm also curious what general differences there are based on the different implementations...
How is this different from Blueprint Sandboxes?
Blueprint Sandboxes is a great mod, but it solves a different problem. It’s a god-mode lab: infinite chests, all recipes, tweakable surface properties, team sandboxes. It’s what you reach for when you want to experiment and polish a blueprint.
Mine is about planning your actual factory. Hit Ctrl+P, select a chunk of your base, and it gets copied onto its own sheet. Tear it apart and rebuild it however you like; the original stays untouched. You can keep as many sheets as you need to compare different layouts, then export the best one to a blueprint. While you’re planning, your real factory is paused, so nothing breaks and the biters don’t advance. There are also power and throughput stats per sheet, and bottleneck highlighting.
In short: if you want a sandbox to experiment in, use Blueprint Sandboxes. If you want to redo part of your base without risking what’s already running, that’s what this is for.