Create Collage of Pictures in Adobe Photoshop

We are working on a project for an Ice Cream shop. I have a simple job - anyone with Photoshop / Photo editing experience can do this. TASK #1. Create a collage of high resulution images about city of Mumbai (images will be provided). TASK#2 Provide impression of the interiors wall (3 sides of the shop) with design. We already have a design in mind and can supply the design (see strokes in attached picture) that needs to be followed. One of the walls will have the Collage mentioned in TASK #1. TASK #1 details: I need to make a collage of Nostalgic pictures about the City of Mumbai (Bombay). this collage will be used on the wall of the Cafe/ Ice cream shop. The key spots reflecting life in mumbai such as: gateway of india, taj hotel, dhobi ghat, busy train, marine drive, colaba, haji ali mosque, chhatrapati shivaji terminus, the mumbai rickshaws, mumbai taxi, tiffinwala, dabbawalla, local newspaper etc. We want someone to use the pictures (we will provide these in high resolution - around 10 Megapixel (3648 x 2736)) and combine these - use different technics - overlap, rustic look, touch-up, negative etc. to create one big/giant collage with many pictures in i (about 12- 14 pictures). We shall then get the collage printed (digital printers/plotters) at high resolution and put it on the wall - use it like wallpaper. (we will handle this part). We need the collage to be of a very high resolution so that we can print it on a 100cm x 600cm space on the wall. Size / RES of collage: on Actual size keep 100 DPI. Pls. provide Quote and time frame. Attached Images: Walls profile / images; strokes design and colours image; wall layout; collage examples.