Picatinny rail to the bottom of an AICS chassis?

http://i1221.photobucket.com/albums...57B88AA-1958-000000F37F90BDA3_zps4d69157b.jpg
http://i1221.photobucket.com/albums...514615-17569-000007F76C9B3445_zps857c2eff.jpg
http://i1221.photobucket.com/albums...6FF668-17569-000007F77B583C61_zps4be02517.jpg

http://i1221.photobucket.com/albums...D5A524-17569-000007F7743856CD_zps35a1418e.jpg

Here is what I did. I took the existing sling swivel off and attached a section of rail for my atlas. I drilled one hole and tapped it for a screw. The other screw is in the existing rail with a nut on the back. Any questions let me know.