Howdy fellas,
I'm glad to see at least a little bit more interest in this build. 

   Although, based upon the response count so far to this non-commital based "Suggestions" thread, I don't know if there's enough interest overall..... 
 
 Anyway, to continue.
I agree with you beachbum on 
slightly expanding the reach of a BWN / Riverine Campaign simply because of the rather limited building options available out there.  In fact, that might be at least part of the reason for such a light turnout in regards to interest in the build.  There's just not much out there which would somewhat force the potential participants to include more scratchbuilding in their efforts.  And only a handful of members here feel proficient enough to attempt that type of project.....
So, possibly including the Navy Seawolves, or Seals, LRRP's, etc. might help with the available Campaign fodder.
Just a quick count off the top of my head I can come up with these potential OOB builds;
Tamiya's PBR 'Pibber'
Tamiya's 'Seal' boat
Revell's re-release 'Swift' boat
if we add the Seawolfs participation;
Hueys
CH-46
if we add Seals and/or SpecOp;
Figures(?)
So maybe there's just not enough material to work with to support a 
specifically Brown Water Navy build.....
Don't get me wrong, I'm not trying to come up with the "Negative Waves' Moriarity". I'm just trying to think about it logically.  
But I will say this.  The apparent lack of interest in the subject is helping me make up my mind in regards to whether I continue my work on building my own LCM / Tango /Monitor conversion build for just myself, or with a 'Master' in mind....
EDIT:   Of course, 'gauging' the interest in a ship/boat conversion offering at a place called ARMORama is not entirely an accurate measure now.....is it?
Tread.