I have built a fair few Ju 88's. Italeri isn't bad apart from the need to engrave panellines the size and shape of the undercarriage bays is too small. Cockpit detail is adequate for this scale. The Zvezda Ju 88 tail is noticable too small. The Revell kit is good though they never brought out the the R or the G's subvariants only the A and C. You are missing the Hasegawa kit whixh is very nice.
