I'm sorry, but I'm not really interested in the suggested trade and I can't find enough that I want in your binder to warrant a trade for a Celestial Colonnade.
The fact that you're located in the UK however is a plus (I'm located in Sweden) and if we can work something out in the future I'm more than willing to trade with you.
I think that [Destructive Revelry] could be a good card in the deck, at least for the sideboard. Gets rid of underworld connections, whip of erebos, enchantment creatures, detention sphere, pacifism, and any other annoying enchantments.
Sedge Scorpion because it's funny watching a gruul monsters player be afraid to attack because he'll lose his massive beater to a 1/1. Can't deny that Unravel the Aether is better but I only list decks with cards I own and I don't have any of those yet.
I have almost all the cards on your want list. The ones that I DON'T have are: Fulminator Mage and Simian Spirit Guide. I don't know if I want to trade away my entire Living End deck, but if we could work it out so I can get your Griselbrand and Snapcaster then I'd be willing to trade.
I know there's a lot of cheap commons and uncommons in Living End, but how highly would you value all the cards together as a whole?
I really like the idea of using Gahiji to make lands lethal, This could be a very fun deck. My biggest suggestion would actually be to lose the token stuff and go straight for a ramp build, with board wide creature buffs like Beastmaster's Ascension and Overrun effects.