Great progress!
It's interesting that you are doing the PBM-5A version first, as this happens to be the only intact version still in existence (at least above water). The survivor is being slowly restored at Pima Air Museum in Tucson, Arizona.
The Netherlands ended up with almost half of the entire production of the amphibious version, 15 of the 36 built (and 4 others converted later from true seaplanes).
Can't wait to see the final product, and thanks too to Nico for the photo!