wingco

That looks really nice Warwix. I agree with the retracts servo info given here. I flew my H9 spit with Robarts and found that BMS136 MG (apparently it'll lift 6.1kg's) worked just fine. Important to check the linkages as those stock retracts can be very moody and wear at a rate of knots with the heavier struts.
One tip I would suggest that doesn't cost anything is to take the canopy off and remove about 1/4 inch of the green plastic all the way round the edge. This lowers the canopy when its back in situ and does wonders for the overall profile. The stock item looks a bit like a Model T ford wind shield! I'll try to upload some shots of it. The shot on the left is the stock item, the one on the right is modified
Happy flying
Wingco