You could build a clay factory. Like in the village mod where they dry wet stone bricks. But the same idea with clay. And lay it out. You can have all types of different jobs for it. Examples: Clay finder 2, Clay seller 2, Wet clay maker 1, Clay Dryer 1, Clay Dyer 1. (the numbers mean amount of people doing that job)

i can't join on the server , why ?

you can make a castle or modern town :D

make cars and detailed houses

I don't know really. But it would be cool to see a giant viking ship. ;D