Howdy
gizmo21
First, allow me to say that I am
most happy indeed to see someone
else working on Brown Water Navy subject matter.

And, your efforts and hard work show.
Even though I'm probably not as vocal as I should be about my BWN passion, I do share this very passion with at least a few blokes hereabouts.
To your build;
Thx for posting {
Chris?} these photos of your build. The pics provided give me a good idea of how you went about it, and show some of the 'details' we scratchers enjoy.
Since there were quite a handful of differing "field mods" done on these boats, I don't suppose you could share the photo you used as reference with us? I would be most interested.
The vessel also appears to be built as a waterline hull configuration, is this true?
And, since you've obviously done some exhaustive R&D on your build, and by evidence in your photos of some sort of scale drawings, from where did you pull these drawings? My reason for asking is any and all scale drawings/schematics/ etc are hard to come by. So any help you can throw towards making this more fertile ground would be apprecited by all us Riverine aficionados. :-)
Additionally, I have tended to focus more on the ATC's {H's, CCB's, etc} than the Monitors......in fact, the only photo I could find in my fairly healthy stash of photos of a "Mike" boat like yours was the one below..........could this be the one?

Also, since all of your kindly provided photos only show your excellent progress on the
stern of the vessel. I cannot see what you are planning for the bow.
Any more photos available?
Tread.
EDIT: As you know, both the 'Mike' Monitors and the 'Tango' ATC's used by the BWN were based on the stretched LCM 3's of WWII fame. These LCM 6's and 8's were used as the base hulls.
And as a {bad} example, I have provided a photo showing where the main hull deck would be located on one of these LCM's. The horizontal lines I have badly drawn on this photo show where the deck is, and the really crummy lines in the middle represent the wheelhouse and turret placements.
Here's the pic......

In addition to the lengthening of the base LCM 3, the hull was also
widened by the addition of floatation 'buldges' on the sides of the hull. This was also true for later ATC's. The early American ATC's, and the French utilized versions did not have these 'buldges'.
In addendum to the side additions, the Monitor's or 'Mike' boats got the pointed prows added for better manuaverabilty in the narrow passages and backwaters of the Mekong.
Geeeeeeeez!...........there I go, rambling on and on about BWN again! sheeesh! Who let the bloody dawgs out!!!