Having made the extra parts required. The instructions were downloaded from Paul's site.
Construction was relatively easy and quick.

The photos show the ribs and the sub rib construction.

The wing was easily constructed by building the right wing, left on the plan built inverted, with the addition of the centre section. When this was dry, fairly short time using cyno and having a "tea break", the structure was slid along and the remaining wing constructed.

In answer to the engines, the offer was for two GMS 25's which I know little about except reading the odd bit off the net. However I must say I was impressed when they fired up on the test bench with only a little priming and were fairly easy to adjust. I ran with 8.5 X 6 Bolly's.
If all goes well here are some further progress photos. With a little teaser taken tonight.