Timeline tips please!

I'm working on 50 photos of the eclipse. I've cropped them all with LR3 and now I have to make one large photo of all of them in rows. Can you do that with LR3 or do i need something else?

I'm trying to do this again- properly. I used MSPaint for this.

HTTP response: 404 | MIME changed to 'image/gif' | Byte size: ZERO | PHOTOBUCKET ERROR IMAGE

Could be done, I'd guess, in LR3's Print module, setting up a custom template and printing to jpg. If you shot in RAW or are editing the original jpgs in LR, it would save having to make all those intermediary image files needed for moving over to a second program.

P.S. If you do it in LR, set the page color to black.

Thanks, I'll give it a try. Got LR for Christmas and this is the first project I'm diving into