8bit

Hello, I'm new here and while on C19 lockdown i've been tasked with learning the basics of VW to assist my PM work in the events industry. I've bumbled along for a while and mostly been adding to existing plans. I've decided to create something from a scan and am stuck at the first hurdle. Can anyone give me some advise on the cleanest way to create walls for the attached plan. Its basically a medieval Italian Hilltop village house with unusual thickness walls. Thanks in advance.