3ds Max and Possibly Photoshop Skills as Well

Hi Everyone
Please take a look at the following image as an example of the sort of work required:
http://www.turbosquid.com/3d-models/3d-sofa-chesterfield-durham/669018
I would ask you to make minor changes to this image so that:
1. The studs at the back of the sofa go all the way down to the start of the cushion. At the moment the leather becomes flat about 20cm above the cushion.
2. The feet are changed to castors - I would supply image of the castor feet but you would have to cut it out and scale to fit.
You would then need to make changes to all images so I have one front, side and back view of the sofa that I would send you.
Then you will need to output all images in Photoshop and jpeg formats.
Next you would place a frontal image in a period room. Take a look at an example attached from our existing product range. You can build a background or drop the image into a Photoshop background or stock empty room image (I have some), as you prefer.
I would like a price for the above work for the image that I have provided as an example for you to showcase your skills. If it's done well then there will be much similar work available to start immediately, so please let me know your time scales and availability.
Good luck to you all with the bidding.
Regards
Ed.