Photo collage high resolution for printing

I need a photo collage for printing in 9000x6000px landscape. I will provide a set of 20-100 4000x3000px photos. Picture will be provided via Skype or Dropbox or Skydrive or simialr. The collage will have a central group photo in large, and others will be arranged as ornament or open to proffesional suggestions. It is desired to have some graphics that will compliment the photography. Filters, borders, shades, blends and such as/when needed but not too much. ## Deliverables The output will be in PSD, where each photo/art is on separate layer. Also, there should be a flatten JPG, or TIFF picture in exactly 20"x30" size. When bidding please provide a sample/URL of your collage. Thanks