Welcome, fellow 4000T owner! It looks like you have all the essentials except a CPU board: ports module, disk module, and audio/video module are all there. But the internal drive chassis seems to be missing, unless you took it out for your photos. It's not critical, but it holds up to 3 drives and adds some stability to the case.
If one of the RAM clips is broken, it's not terrible: you can use 2 8MB SIMMs in alternating slots, skipping whichever one is broken.
Your second floppy drive looks unusual. It may actually be a floptical drive like the LS120.
The coin battery won't leak. If it's dead, you can hook up an
external battery to a 4-pin header nearby on the motherboard.
Otherwise, you've got 5 Zorro III slots and 2 video slots to play with!
Have a look at the entry at
BBoAH for some more info. There's also a PDF manual you can download.