I created a house-maker...as Jamie said, arcs are easy:
Essentially, use clothesline and make a rope that fits around a pin, and one baton lenght away, make a loop that goes around a spray paint can, and so on....
Once you have your "house-maker" you may as well spray the corner pins to make it easy to place punishment kubbs 1 baton length away from the pin:
Based on my very limited playtesting of the Inkastare Tavling scoring, I would suggest not adding a 3-baton length area, and instead just give 1 point for in bounds outside of the house. 3 baton lenghts is just as good as the baseline. I would give -5 for punishment kubbs.
Check my blog, where I score a set HERE