Re: New builder, needs help please:)
If it is the shape of the fuel tank that you don't like I'd suggest searching for one from a motorcycle salvage yard or check ebay and craig's list for something that suits you.
Naturally anything non-kit is going to take some fabrication to mount.
If color is your issue, Dupli-Color automotive paint comes in a huge variety of colors and I've always been able to find paint to match the bicycle color. The engine and fuel tank can be painted to match or enhance the look of your bike.
In all, you're only limited by your imagination/skills, and of course, your wallet.
As for ordering an incomplete kit, you'll be money ahead to get the whole thing and sell or save what you don't want. If you're like most of us you'll be thinking about a second bike and those extra parts just might come in handy down the road.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"