Rachele, welcome to Router Forums,glad to have you join us, I'm positive the members of the community would be more than willing to answer any questions you have
This a friendly forum,there my be differences of opinion on how something may be accomplished
You can load pictures from your computers hard drive before reaching 10 posts!
Your question about the grid if you are talking about the 4 corners you have miter saw, could miter the corners. could you explain what you using this for so the members could better understand what it is you are building and it purpose
Also this is a world wide forum so sometimes it takes up to 24 hours to get some answers so check back
Again welcome