Just quickly you'd need a 10l cube eh and change bitterness hops post 20min that's what I've done but, the cubes I've done some have turned out too bitter! So need to experiment on clarity side a things I know your looking into Golden Promise that bre I No chilled basic brew hops were perfect not over bitter and cleared to see through so that's that maltster so no worries with Thomas Fawcetts Maltster Golden Promise with no chill. I stalled fermentation at 1.020 with that brew! To high mash in 68c remember that she's a reliable extraction malt. Don't know if this helps ya anyways happy brewing bloke!think i'll get time to make the keggle up in next few weeks , would be bloody nice to just cube half a batch and put other half straight into FV