I have a fuse kit for the MKI and my full kits are the MKII. There are some subtle differences in the wing saddle as the MKI has dowels for holding the wing on with rubber bands. The MKII has a stronger belly with a plywood bottom from the firewall to I think midway below the wing (I'd have to look to double check).

Edit: Yup, plywood on the bottom of the fuse to the halfway point under the wing. The MKII also has a plywood tank floor to separate the battery compartment.

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