The LT-40 kit builds very easily. The instrutions are excellent and the parts all fit together nicely. The kit comes with all the parts necessary except the covering which will cost $30. Glue - another $12, Iron - $15, Pins - $3, Hobby Knife....etc, etc, etc........ It will end up costing more than the ARF but you will know alot more about the plane when finished.
I personally enjoy the building process. If you think you might enjoy building then I would suggest you go for it!
Oh, I use an accoustic cealing tile over an old table as my building surface. Holds the pins great.