model 1
I try to do this simple mode, but in a parametric way. Often in such models curves arise in one sketch. It is easier to determine the relationship / bond between the curves.
If you do offset curves and trim. You can add a dimension offset.
Extrude also doing the problem, does not preserve the dimensions. Do you have any idea? So it looks like the inventor:
Selecting outline works only in the structural parts, but does not select the line of cut as INV:
I want to see how to build the model.
if you want to add dimension to the offset, you need to hold down the SHIFT key and then add a lot of bonds: tangent, concentric, conform to gemetria worked.