Hello, here is a short "speeded up" description of
how to use 2D CAD drawings to create a Sketchup Model,
with this technique you simply push and pull to create
the mass model. The windows/doors were already prepared and were inserted
when the opes were punctured.
The two chimneys are created with the intersect and erase command.
I hope this will be of use to you.
regards.
Kerky
http://www.youtube.com/watch?v=IPV91VOhHpk&feature=plcp



