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Depends on how important the computers are to the day to day business, and what your involvement in the business is.

If you're for instance the person generating all the initial leads with retailers then shouldn't you be spending time getting the business off the ground by making those phone calls instead of putting computers together?

And if you need the computers day to day for the business, who are you going to phone if one you built stops working?

Think about the resources - especially people - you have available and focus on getting them to work to their skills. And have a look at the costs and risks and what-ifs for all your options.

Not saying that building them yourselves is wrong, you just need to be aware of what the longer term effects of your decision are.