I am a new user of Solidworks. So any help you offer will be of great service and regarded very highly.

I am facing trouble trying to merge different surfaces (with minor gaps) into a solid. I tried many different methods out there on various websites, forums, tutorials, etc... but, so far, have had no luck. Can anybody please help??? Please can anybody tell me what am I doing wrong here? I know, for once, that there are a lot of knitted surfaces that I've created. Please guide me on how to go about reducing the redundant ones.

I've attached the part file here.

Thankyou in advance.