That’s a really well designed terrain. How long did your son take to model it?
To design the monastery? A while, as I was in Mali on an operational tour and internet was not only slow but limited.
All in all the design was probably about a day, the detailing was the tricky part, i.e. stones, floor, damage parts, windows etc. that was a couple of days off the top of my head. So I would say about a week on and off between work and designing.