[hirofkd]

Welcome to AF.

The SW20 kit has a couple of tricky issues. One is the fitting of the
interior&chassis assembly to the body shell, and the other is the ride
height.

Use quality masking tape, and dry fit the body, window, dashboard,
interior tub and chassis. You'll probably have a difficulty fitting the
interior&chassis assembly to the body. That's because the rear window is
too tall. The front edge of the dashboard might interfere with the
windshield, too. So, you'll probably want to file the bottom of the rear
window a little to ensure precise fitting of those large parts.

Once you are done with the fitting issue, attach the tire&wheel to the
front strut, and check the gap between the wheel arch and the top of
the tire. I'm sure there'll be 2-3 mm gap there, and you'll probably want to
correct that.

File the top of the strut by 1-2mm, while leaving the pin intact. If
that's too difficult, cut the top off with a knife, drill a hole with a
pin-vice and insert a metal rod. But you'll have to invest extra money
on a pin-vice, drill bit and metal rod. After that, there should a gap
between the bottom of the strut and the lower suspension arm. You can
glue a piece of plastic to the suspension arm, and drill a hole. (keep
in mind that if you lower the ride height this way <i.e. by raising the
struts>, there is a possibility of the lower arm interfering with the
wheel. So, whatever you build or modify, always test fit parts as often
as you can.)

Do that to all four corners, and I assure you that the SW20 model will
look much better than the out-of-box one.