i did 2 full floors on mine. never again. if i couldn't get by with patch panels, i would do the 1 piece. i actually would like to do mine over with the 1 piece someday. i didn't take enough time on mine to get them perfectly placed, and to weld all the way down the tunnel and grind the welds down on both sides (i guess that's about 9'+ of weld) . i also cut partway thru one of my belt brackets by mistake. they are placed right in between the new floors and the trans tunnel. i think between me and my friend, we spent at least 5 hours on it (in the shop on a sunday) not including interior. the floors are now tackwelded, seamsealed, and ugly, with one slightly lower... but strong and functional. you only notice it when it's on a lift. i would give myself a week+ to do the same job again, but properly... i'm no bodyman by a longshot.
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when you replace the timing cover, i am of the opinion you should do a new pump and divider plate too. read up on the posts about overheating and divider plate to impeller clearance. you can put these parts on your rebuilt engine when you do it.