#12 units

The sonobe connection is made by a couple extra folds on the outermost petal; the method was first published by Meenakshi Mukerji in her Origami Inspirations.

but the instructions are only for the base + 1 simple var, not the var i did. You can probably figure it out from the last var presented though and remembering that like. the middle angle has to be 30 so everythings still in multiples of 15

soz for quality......... the angles are hard

If you need more help: this (and probably the one above it in the linked flickr photo) uses a 1/3 fold, while this variation i reverse engineered a bit ago uses a 1/4 fold