There's the link to it.
Good luck with building it! what is a dd???
my dad made two learning towers (one for our house and one for theirs) with a total investment of about $75 (a sheet of birch, and green (not color, but safe) paint.
he has thousands of tools, though, including a skill saw, which he used. he made it pretty close to exactly like the real learning towers, and we're very happy with them!
if you want a picture you can PM me
The Learning Tower your Dad made looks fabulous! I like it much better than many of the DIY plans I have found anywhere online. Does your Dad have plans that he made that can be posted?
I have actually been using three kitchen chairs with backs. I block my son in my all sides, so long as it is on an area rug, the chairs do not slide.
The tower is great though!! Kudos to you and the builder.