Your talking about tree nails or "trunnels" which have been used for centurys in full size boat building. (no nails or screws)
Your getting there!
Always be willing to learn & try something different.
Then make it again and make it better.
I am still always milling enough wood for 2 parts cause ya never know when you'll screw up the 1st part.
Just trolling along in jda's thread. He better get busy & post to scatter us outta here.
Pssst Tim, have you made any working blocks yet?