So i just saw this thread, and am sorta doing this exact thing.....
...except I didn't think a 28mm edf would have enough thrust for the Mini F22 either, so I'm doing a 50% mini F22.
I had the electronics left over from an UMX Habu, and have been kicking around ideas for it for some time now. Thought about the arrow, but eventually settled on the F22. Here are some nearing completion pics:
It's 13.5" long and has a wingspan of 10". I'll be using the 28mm edf on a 2s 250 or 300.
I just have to get the electronics in and re-set them up for elevons, then add a bit of color. It looks like it might be tight, but i think everything will fit

I also plan on rounding the leading edge of the wings to see if it will get better lift than the squared off fb.