I built a Strat from a kit that looked a lot like this one:
http://www.themusicking.co.uk/build-you … eft-handed
(Those kits are pretty much the same as the SAGA kits, they just cost a lot less. Probably because they don't have the name on them.)
The pickups aren't great and I'm going to replace the nut, but other than that it's great!
I was told (I bought it off ebay) that it was an Alder body but I think it's actually Basswood...not much difference to be honest though. You can't usually tell the difference by looking at the wood.
Think how much the wood would cost you...even if you have to replace everything apart from the body & neck it's still cheaper.
To be honest I didn't know Stagg made guitar kits... do you have a link to them?