As "hanaldo" writes, the difficulty is in keeping the CF spread tow to "stay in place" ... it can not be done without something keeping it in place around the edge, thats for sure. This does not need to be vacuum, but could be tape.
It will be very difficult to keep a nice straight pattern with spread tow on the edges, if not impossible. Thats why I suggest a twill edge. The border between the twill and spread tow, can be made very nice and sharp by letting the spread tow cure to a slight tack, then cutting the wetted out spread tow on the flat surface, and then very carefully lifting it up at the edge, and putting the twill UNDER the spread tow edge.
an easier way is to paint a solid coloured line on top to cover any imperfections in the edge between spread tow and twill.
You will need only one layer, if you use black coloured epoxy "base-coat" (see the EC "skinning" tutorial video)
To make the surface durable and strong, use a 2 component clear coat, or if you can not do that yourself take the table top to a car paintshop and get it clear-coated.
You can get a very nice structured surface by using peel-ply on top, remove it, and have the car paintshop clear-coat it with several layers of a "satin" clear coat.
leave the edges without peel-ply ...

or polish them shiny with rubbing compound an ... many possibilities ...

Good luck! It will look stunning if done properly ...
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