The last weekend I started to assembling the parts. If they are CNC milled that goes very fast, because each part is very exact. So I made some turning brass parts like the bearing bush and some nuts. The batteries later lie between the brass bars in the middle. You can also see the compressors. The diving system will work with compressed air. We subscribed it a few posts ago. If you want to know something feel free to ask.
regards
Sascha