I would really like to help you on developing this carpet measurement calculator. I've read your requirements and have looked at the example site. I believe the development should be about 10-15 hours. I can delivery by the end of this week. Please contact me at firstname.lastname@example.org to get started.
I've had prior experiences developing home designs and furniture based stores before and would be happy to show you and provide free advice on speed optimizations and answer any questions you might have!
Hoping to hear from you. Adrien Shen Merchant Solutions Engineer