You could set the weight on those items to 5000 and when the order >= 5000 on weight you know there are big things in the cart and that things should not be shipped and then hide the shipping module(s) and only allow Store Pickup to run ...
This would assume if 1 heavy item is in the cart that the whole order is now a Store Pickup only ...
Linda McGrath
If you have to think ... you haven't been zenned ...
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