PaPa,

Good question. Building a kit can be fairly fast, or it can take as long as you like.
If it's your first build, you would do good to spend a lot of time reading the instructions and looking over the plans before anything ever gets near any glue.

Then you can spend some more time planning the radio installation, the covering, hinging and all the other details that go into a kit.

If it's not too cold you can make a test stand and have your new engine well broken in and ready before it goes on your plane.

None of this is hard to do, but it does involve a learning curve. If you can find someone in your area that has some experience with kits, engines and rc flying that can help you, it will make your project easier. Plus you can learn from the experience of other peoples' mistakes, instead of making them all yourself!!!

Another note. A lot of the Sig kits come with a book for beginners in rc flying; I don't remember the name of it. It's a little dated but the basics don't change
and you will find some ideas there as well.

Good luck,
Larry