David,
Good to hear from you. Yes there has been progress on the larger Brushfire, however none since last year. I've been overwhelmed with other projects. I hope to get back on it before the start of summer. Still need to cap the rudder and finish up the bellypan. Looks like I'll be using a 25 size engine but not sure which one. I like the GMS 25, has all the power of an OS 25ax, it's 2 oz. lighter and half the cost.
Here's the specs:
span 43.25"
length 36.25 (nosering to end of rudder)
auw 20.4 oz

Last pic. is a size comparison with my first effort.

Chuck