John,
Thanks for the report that the 40mm boxes were in there! Here's a couple pretty good shots of the Pod panel lines:
http://gunsagogo.org/0002/0002/earlyNam/PN7363.jpg
http://gunsagogo.org/0002/0002/earlyNam/guns5.jpg
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Looking at the exterior of the model, I am inclined to show these detail shots of the visible armor plating:
Front Pylon - right side armor
http://gunsagogo.org/armordetail1.jpg
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Front Pylon - left side armor
http://gunsagogo.org/armordetail2.jpg
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Aft Pylon - left side
http://gunsagogo.org/armordetail3.jpg
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Aft Pylon - right side
http://gunsagogo.org/armordetail4.jpg
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Forward fuselage - left side **Note that another plate extends aft longitudinally from the end of the bottom plate, then another one is mounted at 90 degrees behind that one**
http://gunsagogo.org/0002/0002/earlyNam/PN7364.jpg
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Forward fuselage - right side *no armor*
http://gunsagogo.org/armordetail8.jpg
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Front Pylon - Go-Go emblem & SAS Ports
http://gunsagogo.org/armordetail5.jpg
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Also, concerning the Ramp.... the ACH-47's did not have the secondary ramp stowed in the ramp body, instead, there were support post on either side and a sunken floor for the ramp gunner to kneel in.
Internal Cargo Ramp supports
http://gunsagogo.org/armordetail9.jpg
(also note in the above picture... the .50 cal ammo can mounts have "3" holes, the 20mm supports, "2" holes) I also have a good close up of the placard on the ammo boxes, I'll find it.
Hope this helps...
Take care,
Frank