First of all I think you did a good job with power point to make the initial design.
Little bit about my self, I am a recent architecture graduate, I was trained to use Adobe creative suite such as Adobe Photoshop Adobe Illustrator etc.
If you would like we can chat on the face time or skype about how you want to refine your initial design, then we can start off from there and finish the job within three days.
The work flow will include get the line work of the initial design, fill in the desired color, adjust the depth of the image.
if you would like I can also build a 3D model of the design and render it with actual material you would use on your designs.
Please feel free to contact me.
Looking forward to hearing from you.