The only "cobra" aircraft that I know of is the "P-39" aircobra
which of course is not a bipe
and searching "cobra bi-plane" got 0 results
If you get the exact name of that bipe you may be able to find it
but If you want the air cobra click here.... https://forums.realflight.com/downloads.php?do=search
How ever there is a "python" Bipe.... lol ....wrong snake.... but a bipe none the less.... https://forums.realflight.com/downloads.php?do=search
There is light at the end of the tunnel in this case. Sometimes it takes quite a while to get a modeler to do a specific plane, unless he/she (if there are SHEs out there?? ) wants to do it, or has already made plans to do it in the future.