issue with AMD Demon floor pan..please help newbie

Don't weld until you get it together-I have never had this much of a problem with fitment.Wish you were closer,that just shouldn't be that tough.

what do you mean by dont weld until i get it together? do you mean dont weld until i have a perfect fit? lol i also wish i could get someone that has done this before to to help me out putting it in, now that i few of u have said i shouldnt have this much problems makes me think if there is something else wrong that i dont see :S im im fairly confindent that i got it close enough to start welding, as i start to weld i wil lbe able to push it down as i go.
can anyone recomend the proper sheetmetal screws to use? or is any kind ok?