Looking for suggestions/criticisms

I am in the midst of replacing a floor. I have had to rip out everything, down to the sills and have worked to get his all properly replaced. I have replaced all the joists, and sub-floor, and now I am putting in the over-floor. (I hope I am using the term correctly, this is the plywood layer that goes down over the sub-floor.) My question has to do with the direction of the grain. I have run the first sheets with the long edge all going the same way. (If the 8 foot length of a sheet of plywood is considered the main grain, these all run the same way ie: East to West) Now, I come down to one small section approx 39" x 48. I do not have enough of a full sheet to match the other sheets, but for such a small area, I really don't want to cut into another full sheet (especially since this is the last piece.) My question is - does the direction of the grain really matter? I do have a small piece of plywood which would work here, but instead of matching the grain E-W, the grain would need to be turned 90 deg and run ie: North to South. (Which, as a matter of fact, matches the run of the joists, too.) Thanks for any and all input.

Hey everyone, I'm looking to undertake a new project in my house where I put in 2 or 3 small lighted drywall niches. The wall that I'm putting them in his only 3 ft wide and I have 9 foot ceilings. The wall is load bearing but there's only one stud in my way that I'll need to remove. The wall is about 7 inches deep (two 2x4's deep). I need advice on how to reframe this wall. I did consult a residential structural engineer and he essentially passed on the job saying almost anything I do in terms of putting in a header would be just fine. So with that, here are some photos to help visualize what I'm trying to do and what I'm working with: First photo is the effect I'm going for. This shows 3 niches, I may only do two. [ATTACH]35036[/ATTACH] Here's my wall, as it is today. [ATTACH]35040[/ATTACH] Here's the my wall during construction. I've outlined in green the same area as the photo above. You can see the one stud (two 2x4s deep) that I need to remove and reframe and carry the load. [ATTACH]35038[/ATTACH] This is something I found online that I thought made some sense but wanted to get thoughts. I don't need a header above each niche do I? The one header carries the load to the jack studs correct? Anything that is under that is cosmetic for my niche or no? [ATTACH]35039[/ATTACH] Also, being this is one stud I'm going to assume to err on the side of caution and support this short while even though I'm only taking one stud out for about 30 minutes (before I have it reframed). What is the best way to create a support wall that doesn't damage floor or ceiling and isn't in the way?