Architecture structure helppp

So I’m making a spa sanctuary beneath a cave ( it's a venture 🙏) and I’ve to consider a building construction that may assist it stand and be secure. The trainer mentioned we will use sticks, plates and blocks however we r solely allowed to make use of 2 not all 3. Blocks for homes beneath the cave, mountain or valley, plates for semi open house and sticks for vast areas or one thing it's difficult and I sort of fallen of with understanding and I need assistance. The image above isn't my mannequin however it sort of appears like this however my spa is a bit huge so a number of the rooms are out of the cave a bit and I don't know what sort of construction I ought to use. Please assist earlier than my trainer cooks me