I like Golden Hen too, but I don't know a thing about the recipe or fermentation etc. So I can't really comment about whether it is going to get you what you expect. On your BIABacus though here are my observations;
90 minute boil is preferred to 60 minute, but as long as you are consciously aware of your choice & reason for it, go for it.
Section C - you only need to enter an O.G. value on the right if it is different. No problem here, just an observation.
Not sure where your VAW figure of 27L comes from, but the BIABacus will use this value to scale the hop bill "what you will use". You may be better off finding out the Golden Hen IBU value and entering that instead. However, this too may be problematic as it will likely be difficult to find that value and also what formula was used to calculate it (Rager, Garetz, Tinseth).
It's your recipe, and you are the head brewer, but I am not sure I would do that hop schedule.
I have heard that Galaxy "CAN" be problematic when used as a bittering addition, so I would be tempted to use a neutral, high AA% hop to get your IBU's up, then use the Galaxy purely for aroma & flavour.
One other thing to consider is that the early formation of the hot break has been reported to affect hop utilisation. Due to this, my standard practice is to
NOT add hops to the boil until at least half an hour has passed. With your schedule I would be adding my bittering hops with 30 minutes to go, so I would have to use more hops, or increase the boil time so that I get a 60 minute addition.
I would recommend a hop sock if you can get/make one easily. This cuts down on losses to trub, and means you can make more beer or have more headspace (which I think you may need)!
I am not sure whether you have had numerous brews with your equipment, and therefore know that you will get 75% efficiency & 0.40 L/Kg loss from lauter, but I would recommend removing these entries and using the default values for now. Take notes on the brew day, and compare them to BIABacus predictions. If there is a repeatable difference (recommended to do around 5 brews), then make adjustments to suit.
With all that said; I am confident that if you ignored everything and carried on as planned, it will still make a great beer.
Keep us updated if/when you go ahead, as I am keen to see whether it met expectations.
