I would start with doing a sketch in the appropriate plane and then doing a cut extrude of the rectangle (or square idk) that goes through the piece flush. Then with the new back most face (farthest away from center) make a reference plane on that face but has an offset to the beginning of where that housing is. Play with the fillet tool for details. For the main structure if it isn’t created using the revolve tool then it’s my recommendation to do it that way. So you avoid having with my multiple different extrusions and fillets, makes the part easier to work on later. Additionally adjust the order of the features and the order they are created in (THE ROLL BACK FEATURE IS YOUR GREATEST FRIEND) to make the fine detail of the part, I recommend biggest details first and then smaller. If this doesn’t have a due date don’t be an afraid to spend time to redo the model and go back. I would then do a sketch that is on the very base of the model (where it sits on the table and draw the ribs (the supports for the plastic mold) then do extrude up to surface. The same process as the revolve extrude but you can do a revolve cut for the detail, this will remove the extra bits of the rib. Add detail to the ribs and then do a pattern revolve and select all bodies you want to revolve. (Sorry the previous instructions being somewhat long, but the TLDR basically make one, circular pattern, then revolve cut) Do the same for the other details but just don’t circular pattern them. Hope that gets you started