Computer case modelling

In theplace of the deleted polygons create a rectangle and a lot of circles whichwill be the holes of the grill. Attach all the circles to the rectangle.

The extrude it so it willbecome a 3D object. Select all and make it gray color so we can see better.

Now give the side of thecase some detail.

Nowfor the bolt if have followed this tutorial carefully it will be easy to make abolt like the one the picture:

Note: I haven't made the screw of the bolt because it will not be seenanywhere but if you want to make it take your time) .

After you make the bolt just place copies of itwhere it is needed.