Because I use so much materials, I always buy in bulk. All Micarta and G10 I buy is in 12x5 plates / sheets. and sometimes I get 24x12inch sheets of a similar canvas / linen phenolic which is available locally.
Yes, sometimes the weave can run in unique directions which will affect the finished product looks.
You should be able to see the direction of the weave on the surface, try to keep pieces cut facing the same axis (ie.- lengthwise or crosswise). Also, you might find that different plates marked the same may actually have totally different weave components in it. It could have come from different batches and have slightly differing stacked weave arrangements / density / colour etc. So I always cut matched handle slabs from the same sheet.
Also, the larger sheets are cheaper for the bulk, although I end up paying airfreight anyhow ... :grumpy:
Hope this helps. Jason.