The SU-100 was a Soviet casemate-style tank destroyer armed with a powerful 100 mm anti-tank gun. It was used extensively during the last year of World War II and saw service for many years afterwards with the armies of Soviet allies around the world. The SU-85 was developed from the same chassis as the T-34 tank, but replaced its turret with a casement installation allowing larger guns to be fitted. Designed more as a 4D puzzle toy than an accurate model, the kit has a weird construction design, with parts of the hull and chassis broken down into interlocking shapes that snap on with built in pegs. The parts are unnumbered and most are not on sprues so identifying which part attaches to where was quite a challenge. It would help if you were familiar with the tank since visual identification oif the parts would be a must. The tricky part is the middle subsection where there were no identifying details and I had to magnify and study the instgructions again