Crane vendor Reiling has added the rail and slotted holes into the rev F of the crane structure drawing. Autocad drawing has been uploaded. Please check drawing and give approval to additions of the crane supplier Reiling.
Furtheron, remark of crane supplier is to give each steel connection of structure a proper/unique  marking, also include marking in drawings. These markings are necessary for assembly. Other remark of crane supplier is that bolts and nuts need to be european sizing, since the crane supplier doesn't have tools for other sizing (for example no US or UK size).