very nice build! your questions regarding the dx7, a specktrum radio will have a higher mw output if you get it from usa, and that may make it illegal in your country, im not entirely sure on the ratings in sweden but in the uk the radios from usa wont be legal to use.
Since your from the EU check out fast-lad should be no import tax
http://www.fast-lad.co.uk/store/inde...sort=1a&page=1