First off, google Land Raider Ares to see what you'll need. Buy/trade components if you don't already have them, grab some plasticard, fiddle a pit, paint and you're done. If you want to go the supereasy route you can even use flamestorm cannons for the sponsons from the Land Raider Redeemer, just have to let your opponents know they count-as twinlinked Heavy Flamers.
For the front I suppose you can use the Vindicator front, or just plasticard it, not sure on the fit but you'll likely have to plasticard a bit anyway, which would be easier to do firsthand rather than trying to use someone else's pictures, unless they provide templates. But really, it can't be that hard.
Is there a specific part you're stuck on? Seems rather straightforward to me.
Edited for clarification
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