John,
I have been thinking about this one for a while and I think you are basically correct in your summary of the major changes to the Huey Hog kit. Here are a few images I'll put up for the discussion to follow.
First a couple of 20th SOS UH-1Ps (armed UH-1F):
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A stateside UH-1F from 1975 at Whiteman AFB:
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A UH-1D of the 190th AHC (photo was taken by a 68th AHC member):
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OK, so here goes.
1. Yes the UH-1F had a lengthened tailboom to accomodate the 48 ft rotor (same as UH-1D). however if you look at the top photo and the bottom one you'll see that the D/H model tailboom has a shot section at the root of the tailboom that is a constant diameter while the F model has a evenly tapering tailboom beginning at the root. To further confuse things, in the photo of the Whiteman Field F model, it appears that a UH-1D/H talboom may have been used. iIf you look at the area where the tailboom joins the fuselage, you can clearly see that there is a change in the slope of the bottom of the tailboom. Not sure what's up with that.
2. The UH-1F has the narrow chord, symmetrical horizontal stabs characteristic of the B model. You can see that in the top photo. Luckily for you, the Huey Hog kit comes with the narrow chord B model stabs instead of the correct C model ones.
3. If you are building a 20th SOS bird, note the twin blade antennas on the roof that was characteristic of in country birds while the stateside Whiteman F model only has one.
4. The F model has a nose mounted pitot tube like the Bravo model not a roof mounted one like the Charlie.
5. While the in country UH-1F's had particle separators, all the photos I have seen of stateside birds have either the bell mouth intake (not as much dust stateside I guess) or a totally different intake configuration (see Squadron UH-1 Huey in Action page 35). I believe this is the type of itake on the Whiteman bird above, but the area is covered.
6. Fuel filler is on the left like the UH-1C.
7. I think you have covered the exhaust issues
I think those are the major differences I have noted. Good luck with the build and please keep us posted.
Ray