very nice..........
The three cannon version had three equi-lengthed cannon panel bulges (one for each cannon) in line with the muzzle orifices.
You may have also copied an AH rendering error on the under side of the fuselage. If you look at the book you just bought you will se that the La7 had total coverage of the wheels when the gear was up as opposed to half coverage as per the la5FN
Check the Blue/green interface detail under the horizontal stab