About this detail of the Tiger
The Tiger 1 had two access hatches in the hull bottom, underneath the engine. In the 'initial' and 'early' models there were two identical round hatches, one on each side.
Dragon have molded the hull bottom with one hatch cover represented as raised detail, and the other as a separate part. Apparently they were planning to reuse the hull for later models of Tiger.
Unfortunately, the printed instructions do not tell you to apply the separate part. It is part F-19 and its position on the hull will be very obvious when you look. You should apply this part to all Initial Tigers.