Does this business idea work as an online business?

It is a fact that there are some e-commerce business ideas that are just going to work better than others, and if your idea falls into the category of ‘difficult to do profitably’, you might be better coming up with an alternative idea. If the business is apparently not suited to the internet and e-commerce, then you’re better dropping the idea from the beginning.
Think about any artificial limitations that might be applicable to your business as well. For example, if you are considering launching a business to supply heavy plant and machinery, that business immediately has a very limited geographical appeal because you cannot realistically deliver a crane or a dumper truck to the other side of the world at a reasonable cost. Consequently, by choosing this business model, you have immediately removed some of the major advantages of e-commerce, namely its ability to attract customers nationally or internationally and to do so in an economically attractive way.
There are some businesses like running sports clubs or bowling alleys, amusement parks and the like that are never going to work online. While you could take bookings and sell sports and bowling equipment
and clothing from an e-commerce web site, the basic idea of running something like this does not work online.
Think about your local electricity company. Although they can accept bill payments online, most of them already have perfectly acceptable home delivery systems in place, so there is no scope for expanding their business via the internet at the moment.
You need to adopt a practical approach to your ideas from the beginning. If whatever you want to do is unlikely to be successful, drop it before you waste any more time and effort.