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Here is some more info that may help.

I just found this, it's general but it gives an excellent visual overview of the battle, and sheds some light on the combatants.

https://www.usmcu.edu/Portals/218/HD...=1558615163718

The good old USMC digital library files has a wealth of info that you should be able to use:

https://www.usmcu.edu/Portals/218/HD...-16-102102-263

There is some good nugets in this tome...look at pdf page 10. I think it has all the NVA info one would need to construct scenarios and a compaign from that.

Although allied intelligence reported elements of two North Vietnamese Army (NVA) regiments (4th and 6th Regiments), two sapper battalions, and an assortment of Viet Cong local forces in Thua Thien Province, there was little evidence of enemy activity in the Hue sector.

U.S. order of battle records listed the 6th NVA Headquarters with its 804th Battalion in the jungle-canopied Base Area 114, about 20–25 kilometers west of Hue. One battalion, the 806th, was supposed to be in the Street Without Joy area in Phong Dien District, 35 kilometers northeast of Hue.*

American intelligence officers believed the remaining battalion, the 802d, to be about 20 kilometers south of the city or with the regimental headquarters in Base Area 114. According to the best allied information, the 4th NVA Regiment was in the Phu Loc area near Route 1 between Phu Bai and Da Nang.

Unknown to the allies, both enemy regiments and support units were on the move toward Hue. Among the new arrivals was the 7th Battalion of the 29th Regiment, 325C Division, a unit that had come from laying siege to Khe Sanh.

THIS!

Also new to Thua Thien Province was the 5th Regiment, a three-battalion unit that normally operated from Base Area 101 near Quang Tri City. Other reinforcements included an artillery battalion armed with 122mm rockets, two sapper battalions, two 82mm mortar companies, two 75mm recoilless rifle companies, two 12.7mm heavy machine gun companies, and a special unit equipped with 50 rocket-propelled grenade launchers (RPG7, or B41) that had greater penetrating power than the older and more common RPG2 (B40) weapon. By the eve of Tet, the enemy had quietly assembled a strike force near Hue equivalent to at least 14 battalions.

So it seems to me that the NVA had much more firepower the you give then credit for based on a flim.