Having lived in the tropics for decades including offgrid, no electricity as this might be, I would never build with high mass materials. They retain air temp during day then emit all night, you dont need direct sun for high thermal mass to retain its 33C for many months. Best for living house I ever experienced was old railway line pole, slightly elevated home, no walls bar the bedroom but flyscreen around all sides with covered verandah all round house perimeter. This allows no insects but catching all breezes. Using mist water spray on perimeter and you have cooling of the house. If you have small solar, ceiling fans do all thats reqd.
Have a look at Papua New Guinea native homes, elevated low mass structures and they have huge amounts of clay and mud to use right at their door if desired.
Having lived 50C Deserts and Tropical my half century, those two while appearing same issues work differently in real life living.
Best and easiest for me was just living no electricity or refrigeration under a tin roof no walls at all for years in the hot Tropics, too many insects, snakes etc though if living with loved ones, besides dogs.
