I built one for our son before he was born. Maple and walnut and very similar to the one in the first link with the tent. The side rails were the same an the one pictured. Typically "kids" wand to be treated like they were about 5 years older than their actual age. Once out of the crib and into the "big boys" bed I built a taller side rail that attached to the existing side rail to keep him from rolling out at night. Once he was 4 or
5 years old we removed the extra rail and he has been using that bed up through today, he is a senior in college and will graduate this spring.