Yeah you think they would have learned from the FW-190, Ju-88 combination. That's a waste of two Me-262's, okay more like 1 1/2.
It's only a model. Messerschmitt Me 262 Mistel, Dragon Models Ltd (DML) 5541 (2004) Trolley wheel not touching ground gives it away.
I don't think they had gone that far...AFAIK, this was neither a planned or paper project. From what I recall the paper project was to have been the, as yet not produced Me-287(?) bomber lugging the unmanned 262. But, then again, they had paper projects for 120,000 ton battleships and 1,500 ton tanks.