Dome on the top of the model:
1. make the dome at the top s
2. don't cut white part of a dome just glue all parts on it
3. when you made dome then take the big a1 papre, put the dome on it and mark the cirkle
4. when you finish with marking the cirkle before cutting you need to leave parts for gluing to the dome, after that then glue it to the dome and with that the first part is over.
1. Because the middle part is built from 2 parts upper and lower, you need to connect them, then just keep glueing using 3d model on your pc,
Arms and Legs
1.Built the midle
Build the middle leg first from upper to lower and finish with the bottom
Also if you don't use strong glue you can cut the round part on upper part of arm and through it you can glue the arm-leg to the model.
Hope this will help you but it's hard to explain without build guidelines.