Lastly, once both the "bottom piece" and "top piece" are attached to their Blu-Ray assemblies, you can go ahead and place them onto the larger main structure. They're meant to be screwed on with the original rubber thingies, but you can also just glue them on or even leave them loos...
An M8 nut and bolt, copper washers, sealed with none-hardening sealant produced a water-tight blaning plate. ___ Next - fit the dipstick tube. This is simply slotted into a hole in the block, with a copper washer and rubber o' ring to act as a seal. In a really half-arsed...