Is it very easy to build up a frame, wheel set, bars etc on the frame I have now and then just swap everything over to another frame easily down the road? Or do the parts for a fixie not swap that well? Any help appreciated, building my first fixie and I'm not as happy with the frame I have now but would like to go ahead and build it up for the time being.

68mm BB/english
1 1/8" headset
120 spacing
42mm chainline

if you don't know what those terms mean, you're going to have a probs building it up in the first place. a fixed gear/ss is pretty simple to build up or swap components to a new frame with the right tools.

Like I said, I am a bit of a newb and trying to learn this all for the first time. I have some understanding of the things you listed but will make sure to do some further research on them. Thanks. I figure the best way to learn is to try and build one myself, I figure the 2nd time around I'll know exactly what I want to use and hopefully can at least use some of the major components from the first try.

I am doing it to my steamroller (on which I have been slowly swapping parts) right now! I love the buy-as-you-ride style. Converting to a Bareknuckle. Just make sure that the fork, bottom bracket, and seat tube are compatible with your parts, that you have all the right tools and other stuff (like grease, etc), and everything should be cool.

Enjoy the new build.

Do you have a LBS that is willing to help? Mine is excellent. I would have made some major and costly mistakes along the way if I didn't have them to reference. Go find yourself one, if you have not already.

is it harder to upgrade from fixie to tarck, than to upgrade from fixie to fixie?

going from fixie to tarck just takes risers and removing all the decals that came on the bike and putting on your own.

And you need a lot of brightly colored anodized parts.