A good idea indeed, but be aware of what you can and can't do crossing a border with the car. When I bought my car in 2007 and had it shipped from St. Louis, USA to Guelph, Canada, the shipper/customs broker advised against having any loose items in the car, i.e. boxes of things. This may have just been a matter of being proactive to avoid unnecessary delays from the customs agents wondering 'what's in the box?' and not a hard fast law. I would at least ask before buying the parts assuming you can just throw them in the trunk and then finding out you actually can't.
Check your parts prices on the DeLoreanGO parts page and compare in your local currency to the US prices on the Houston page. DeLoGO's prices in Canadian dollars including shipping are often 2/3rds to half of what it would cost me if I bought the exact same things directly from the US. No idea why it works out that way, it just does.