RE: Are Guillow's kits any good for practice?
The lancer kit would be similar to a sig senior type of construction, that is if the seniors still build the way they used too, LOTS of cutting sticks, sanding gluing. the small balsa stuff will teach you patience or destroy it! grin
However if you can build a small stick kit straight you can build most anything straight...
I honestly don't know about the rc kit you are building, but I can recommend the sig four star kits as fairly decent entry type kits.