Custom Siding Design Help??

[BenReece]

Hello!

 

I have a client who is wanting this kind of siding design (see attachment). I am a fairly new user of CA and I am having trouble finding a siding material and even trying to create one to mimic this design. I have tried creating a polyline solid and converting to a symbol, and that worked for me when I was trying to make horizontal deck railings. But it will not let me do the same thing with the siding. Anybody have any tips? They just want 6" trim pieces spaced apart over a smooth hardie board siding. Very similar to board and batten but more space between the trim pieces. Any help is appreciated!