In this step we will create everything else. Little handle details, and the pins…
Lets make that handle grip. Create a rounded rectangle, so using rectangle command (click on Rounded option) create one rounded rectangle. Using end or mid option in Osnap, align that rectangle on the mirroring line with near osnap option.
Using circle command, create two circles, one with 4 units diameter, and one 5. Trim off the parts you don’t need, and using Copy command, copy that 4 times. The last one is slightly scaled down with Scale command.
You need to project the rounded rectangle on the upper surface of your base model (Project command). Then, using rounded rectangle, make a hole in your base model. You’ll do that with makehole command. Prior to that, you need to make sure your surface normals are set to outside. Using Dir command, check that. If the arrows point to inside, then you need to change that with Flip command. Then, make a hole deep about one unit.
Next, I have isolated everything except that rounded rectangle curve (using Hide command, or you can put everything in one hidden layer) to make things easier.
Using PlanarSrf, create a surface out of that curve.
Align those moon-shaped curves so they are in the same plane as that surface, and using Split command, split the surface, and move the split surface up by 0.2 units. Using Loft command, connect the edges 1 and 2 like on the image:
Next, extrude the outer edge, and fillet it with 0.1 units.
Again, like above, make a rounded rectangle, and Project it on the top surface. Using that projected curve, make a hole.
Using that projected curve (rounded rectangle), we will create a cushion for pins.