[euromodder]

Welcome to ecomodder !

A grille-block can be made quite easily with tape or some plastic plate - many use coroplast, the stuff election or real-estate signs are made off.
You can paint it black or your car's body colour, then put the block on the inside of the grille, so it doesn't really show.


An undertray or belly-pan is a bit more involved to make, as you need to be able to get underneath the car to install it.
Fixing it to the car takes some ingenuity. You'll have to see what's there, and how you can use it.

Some members use CAD to make one : Cardboard Aided Design ;-)
Cut and glue to shape, then when you're happy with the fit, transfer the shape to more plastic or even aluminium sheeting.