Awesome work! Could only wish that I have the same CAD skillsets as yours.
Speaking of which, I did some rough measurement on the GJ-11 flying wing UCAV, which yields about 52-degrees of wing sweep angle in a ~12.2-meter length x ~14.4-meter wingspan airframe.
Next, based on the Neixiang Air Base's satellite imagery, using a somewhat more conservative wingspan of ~57.5 meters and a sweep wing angle of 50 degrees - I've obtained two probable flying wing designs with an overall length of ~41.2 meters.
View attachment 159660
The left one is B-21-esque, whereas the right one is a partial modification of the former and is GJ-11-esque.
The rectangular boxes in the middle of each airframes represent 2x internal weapons bays (IWBs) (the inner two) and 2x engine bay access hatches (the outer two). All the boxes are ~15 meters long x ~3 meters wide.
Each of the two IWBs can fit 2x 1.2-1.3-meter diameter missiles abreast, or 3x 0.8-0.9-meter diameter missiles abreast.
Needless to say, a small part in me really wants to stretch the IWBs' width to ~4-4.2 meters wide, such that 3x 1.2-1.3-meter diameter missiles abreast or 4x 0.8-0.9-meter diameter missiles abreast can be fitted inside each IWB. However, this may/might be rather stretching (pun intended) on the airframe while within the imposed size limitations.
For comparison: The B-2 has 2x IWBs of ~7.4 meters long and ~2.4 meters wide each, alongside 2x engine bay access hatches of ~2.8 meters wide each.