RE: Mini Funtana + OS15 = Awesome little plane!!
That's a good looking job on the conversion.
The only advice I have is on the RX in there. It looks like a GWS Pico 4 channel? I have a few of these and they do get some glitches, which can be severe. Only a suggestion, but you might want to consider getting a slightly more robust receiver. I assume you'll eventually want to get low and slow with this plane and I personally wouldn't trust the GWS for that, one good glitch and you'll be done for.
For my little 1/2a planes its no big deal, but for something this pretty I would want to have solid reliable control.
Duke