2 month ago I made a Blast Corps speedrun and send it to SDA.
However, it's still in the "runs needing verification" list, so I don't know when it will be up.
It's an any percent run till the credits, so I don't go for platinums.
In some levels you have to rescue a scientist, and while you go for him, the nuclear transporter reaches the end of the level and the mission ends. Afaik it's not possible to clear these levels, rescue the scientist and finish the level by yourself. So these levels can't be done faster or slower (maybe read more about it in my comments:
http://www.superplayers.de/stefanmahrla/comments/ ). But in a 100% TAS run you could already try to destroy as many buildings as possible, before you rescue the scientist. So definitely go for a 100% TAS, not just an any % run.
My time is ~47 minutes on PAL. So NTSC would be much faster and because I couldn't use the Z-trick, I had to play Oyster Harbour and Ebony Coast twice. NTSC users could do both levels in one go. I think I loose 5-7 minutes because of this. So a NTSC or TAS run (any%) might be possible to do in 30-35 minutes. Don't really know about 100%, because you have to find all RDUs, destroy all buildings, etc.
And as StrangenessDSS already mentioned, there are some lesser known glitches in the game like the Outland Farm bridge glitch or the lap skip trick in one of these driving bonus levels (I think it was Bison Ridge).
The high jump at the start of Blackridge Works might be helpful for destroying the first big building.