If you have a chance to pick up Osprey's new book on VC and NVA fortifications and tunnels by Gordon Rottman I would recommend it. 3 miniguns from 1000 feet plus would not have done a thing to a VC spider hole, and from how the fortifications in Rottman's book were described, US military planners themselves ran into the problems you are describing.
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Hits from 750 lb. and 1,000 lb. bombs, with their crater only 6-10ft. from bunkers, left them intact. Walls and roofs did not even collapse...One example is a triangular 12.7mm AA machine gun position. A 750 lb. or 1,000 lb. bomb landed directly in between the three pits, creating a 20ft.-diameter, 10ft.-deep crater; the pits were 36-60 ft. apart and remained unscathed. There were 2-3-man fighting/living bunkers within 10ft. of 38ft.-diameter, 18ft.-deep craters - and the bunkers survived.
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The general conclusions concerning the effects of artillery and air strikes were summarized in a study as follows:
*NVA bunkers withstood anything but a direct hit by artillery or bombs.
*Delay fuzing produced the best effects against bunkers; however, much of the ordnance penetrated too deep before detonating in the soft soil.
*Super-quick fuzing was effective for stripping away camouflage to expose positions, but was not effective against bunkers.
*Napalm was not effective for burning off large areas of foliage. WP artillery rounds were more effective.
*105mm and 155mm howitzers were not effective against bunkers.
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So from that you see that in the realism department the scenarios you describe might not be too unrealistic.