Have to disagree with Myles I'm afraid
I'd pass with North first time and then, as Catherine always says, 'bid the tickets off it' after you have first shown you are weak. Bidding 3D after your partner has opened and west has passed is just asking for partner to try a horrible 3NT with some sort of 18 count.
As Frazer says, you have both majors, so it doesn't look like opponents have an easy major suit game on. In the Europeans your opponents will be good enough to get around pre-empts like that (lets face it, everyone plays a takeout double!) and they certainly won't be scared of punishing an undisciplined bid.
Myles's first suggested auction (when north passes) seems alright only personally I play michaels and the unusual NT to show specific suits and therefore I could bid 2NT over 1D to show the two lowest unbid suits, clubs and hearts.
This is a great bid in highly competitive auctions because it doesn't matter if opponents take your room away - partner knows your suits straight away. The only problem is obviously when you don't have two touching suits but I've never found it to be a major deal and the advantages outweight the disadvantages - particularly in junior bridge in my opinion.
The second auction (north bids 3D (yugh)) I kind of agree with although it would seem more than likely that west will convert to 5S thinking you have hearts and spades. (You have suggested both majors, only have a doubleton spade and opponents are leaping about frantically in the minors - looks like partner has a 5 or 6 card spade suit to me)
I therefore might be tempted to bid 6C rather than 5H (since 5H-5S-6C is asking to be doubled)
A cracking hand indeed - you should write it up for the SBU news to get something junior related in it.