I can't believe the project is on hold! JK.
I know you wouldn't want to set the tank up just to have to take it down shortly after.
I think the small kink in the hose of the filter will be fine. It doesn't look like its bent too much, so it shouldn't affect the water flow much and I really doubt you'll have any problems with it like that. I'd just make sure the clamp is as tight as you can get it though.......better safe than sorry.
As for the Gibbi.........they get huge, just like Commons. Someone on another forum had a picture of one from a local aquarium.....it was atleast 2ft long. I know 100g tanks are huge, but I don't think that would be big enough for a 2ft long pleco. You'd have to make sure you could provide it with an even larger tank or find a new home for it when it got that large. I'd be scared of pleco that large....lol. Would be something trying to move that thing..... I'm sure you know they get huge though, but I just thought I'd share. I'd personally get something else that doesn't get quite that large. Atleast then you'd know if you couldn't get an even larger tank or rehome it, that it would be fine in your tank forever. And maybe it wouldn't get that large in an aquarium, but they have the potential to get huge and may be stunted eventually. Thats just one of those fish that shouldn't be in the aquarium trade IMO...like Common Plecos.
What about a Watermelon Royal plec.....they are supposed to get about 15":
http://www.planetcatfish.com/catelog...species_id=337. Might be a little expensive though.....not sure how much they go for. Or a regular Royal Pleco would be fine. They'd need some driftwood to chew on though (same with the Watermelon Royal).
But atleast it would get quite as large as the Gibbi.