52cm seat tube too (well actually 50 c-c as it's sloping) so too small. The Thorn's are good frames, I was very close to buying one for my winter bike. They have a bit of an audax/touring image so your white bar tape band won't like them , but then they all ride plastic bikes .
If you don't need to biuld it up until April then ebay will definitely be your friend for groupset bits as you can take your time and a lot of stuff is available on there new and boxed from dealer selling old stock. Keep an eye out in Butler's too at the end of the year as they will sell off "old" kit. You can also get a 20% discount rather than the usual 10% at the end of the year in their sale.