[BullseyeHawk]

Use the special gamemode of mapEditing by Shabi Roxx (https://sampforum.blast.hk/showthread.php?tid=409361) Very awesome <

Or, use MTA or anything else that you can build with. And build a barrier around the objects.
If I didn't understand your question, explain to me by what do you mean 'blow over some interior walls'.