I added a base to my original Mad Hatter to tie the model together and for added stability since the Hatter is a little top heavy.
Full model and instructions:
The base is flat without indents for the feet or mushroom. Simply position the original model as per the photos and glue it down.
Retired software engineer, learning CAD design and 3D printing. When creating models, I strive for support free designs and fun creations.