Convert HTML Template Into WordPress Page

I’m currently looking to start using squeeze pages on my WordPress install however rather than use my primary theme for the design – I want to use HTML templates such as the one here:

http://themeforest.net/item/dotbiz-multipurpose-parallax-landing-page/5672893

My question is – what would be the best way to plug this template into WordPress, and also is there a way to use multiple themes at once.

Thanks very much in advance!