I can but just any ol' design is not what I typically supply. You'll need to specify the vehicle to configure the enclosure right.
Available space in H" x W" x D" and not just what looks like it'll fit but what will actually make it thru the trunk opening or however you are going to get it in there. Unless you want to Kreg it and build it in the vehicle... haha.
Other information like amplifier/power supplied and music tastes plus overall goals are highly recommended too.
But yes... I'm pretty sure I can come up with something if you have some space to work with.