In my experience so far with hikashop and interactions with developers, I think it would be best to use css to hide those elements.
<div class="dimensions-style" id="dimensions-field">
...
</div>
#dimensions-field{display:none;}
.dimensions-style{display:none;}So you can hide it based on id or class
It will be much easier this way for future maintenance or updates that you will do when installing a new update of hikashop / hikaauction / hikaserials for example and it will be just as easy if you want to use those fields later, just make what you need visible.