rough over view
The Author say that demanded Fl. E 6 IV for possibility installment of MK 412 and MK 112 into 8-262
was made in researchcenter in oberammergau
at hand of project drawings was needed volume of both weapons compare and came to conclusion
The installment of MK 412 and MK 112 is possible in combination of two MK 108
MK 412 and MK 112 will have 40 shells and each MK 108 has 90 shells
although there will be issue with maintenance, the MK 412 & 112 have comply remove from Aircraft.
Notes on Machine canons
MK 108 was a 30×90RB mm caliber autocannon using ammunition with various shells, including practice, armor-piercing, high-explosive and incendiary.
Rate of fire 660 rounds/min, Muzzle velocity 540 m/s, length 1075 mm, weight 58 kg
MK 112 was a 55×175RB mm caliber autocannon develop out the MK 108 (prototypes only)
Rate of fire 300 rounds/min, Muzzle velocity 600 m/s, length 2012 mm, weight 271 kg
MK 412 was a 55 mm caliber auto cannon, a modified 2,7 cm Flak gun.
Rate of fire 160-295/min, Muzzle velocity 580 m/s. length 3095 mm, weight 190~278 kg
source
Die deutsche Luftrüstung 1933–1945 volume 4, by Heinz J. Nowarra. page 129-130