Chain Link Chamber
I decided to lose 43 frames and do a backwards switch to get to bonus #2 so that I can save time by doing another successful backwards switch right after the bonus, and have Diddy for the rest of the level. So the 2 places that Arne found- in the wall underneath the two cannon krocs, and the indent with the DK barrel to skip horizontally through the wall- were the only places that allowed a successful backwards switch that did something useful. I found many other places to get inside the wall, but either I didn't shoot straight up or couldn't use it to horizontally create a shortcut. The rest of the level is really fast, so I am very proud that A) the level is really fast, faster than Sami at many parts and B) I pulled off two backwards switches, the first which loses 43 frames but the second which compliments the first and saves seconds by not needing to use Dixie for the rest of the level or go up and down the chains in the normal route.
And I thought this level was going to take me days...
Toxic Tower is going down! Are backwards switches possible here too?