I have this set too and and can confirm that they are very nice.
One correction on your description. You say,
"MG weapons were first mounted on pintle mounts but as the war progressed, using bungee cords to suspend and retain the gun became a common practice, as the bungeed weapons allowed for increased firing angles. "
You have that backwards. The bungie cords (actually surgical tubing) were used before the pintles were available. In early UH-1B/C/ & D models, doorguns had no provisions to mount them. It was expected that the gunners would just hold them. To make this easier, the crews hung them on the tubing in the cargo doors to mount them. In about '65, the pintle mounts became available and replaced the surgical tubing. Later C models also used a mount called the samgaki mount since it was named after the soldier who designed it. It was a swing arm that attached to the weapons mounts for the guns/rockets.
UH-1B w/Surgical Tubing
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UH-1C w/Samgaki mount
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Early (1964) UH-1D w/o pintle mounts or doorguns
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Later (1968) UH-1H w/pintle mount
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The pintle mount was used on US Army Hueys up into the mid-90s, when they were replaced in front-line units by UH-60 Black Hawks.
UH-1H w/pintle mounts in Saudi Arabia, Operation Desert Storm, 1991.
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And still used today on new Iraqi Air Force UH-1H++
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Also still used on US Dept of State Airwing UH-1H++ in A'stan as well.
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