Can be abused for XP
Crafting can be abused for XP
Exping is the most boring part of the game anyway
very good idea, just fix it with "You've build your first tent you recive {inster xp amount here}" and cannot get xp for crafting second, third and so on....
Exp may be just awarded for first time youll make tent. That would be valid way to make it boost for noobs and new alts which is pain in the ass to exp on very low levels without opening too much ways to abuse it.