Price Check: cm201 w/ laser cut window of buyers choice

Hi

I have a cm201-sx2 case in very good condition (excuse the dust on the filter tho)

http://www.neo-fusion.co.uk/pics/cm1.jpg
http://www.neo-fusion.co.uk/pics/cm2.jpg

I have access to a laser cutting machine so I wil have the sidepanl laser cut with the design of buyers choice (buyer must give me an autocad / dxf drawing of design for me to have it cut)

remember that laser cuttin is quite expensive :)

how much would i be lookin at for this?

Cheers

Tom