On the one hand I wouldn't read too much into the specific details too much (like, it appears on this model there are no air intakes visible to begin with, with those to be modelled at a later date).I think this is more of an aerodynamic concept since I don't see a lot of room for weapons bay, which admittedly is a shortcoming for aircraft with belly-intake.
But at the same time, what can be surmised from that particular configuration is the dorsal/topside engine nacelles which are quite significant in size which would likely be able to accommodate most of the engine and a significant part of the air intake duct as well.
Obviously we don't know how big this model is meant to represent --20m, or 22m or maybe even 24m long?? Which would change the assessments of weapons bay size.
But even taking a middle ground approach, say 22m, I wouldn't be surprised if it had a decent stores capacity.