The beading appears to be more of an oval shape on the tender and coal rails.
More importantly where the beading is attached to the tender side at the front, it is also on the inside so is in fact full form, but attached as two halves. The same applies to the A3 cab side sheet, it should be beaded inside and out, something I didn't do on my DA A3 and since regret as the edge looks a bit thin, but being as the cab is all made up now there is no easy way to form and get the inside beading in. My mistake was looking at photos of Flying Scotsmans cab during refurbishment, at some point they removed the internal beading from above the cab seat area up to the cab roof part, this now appears to have been corrected on the latest rebuild.
The beading on the A3 cab looks to be true half round, but the beading on the tender appears to be a more oval cross section.
This is a section of the W1 cab, I think the A3 beading might be a touch smaller (2-½") and the GA does not give the thickness, just the width.
A section of the GNR tender showing the corner turn in and beading inside and out.
Again, no information given on size but the oval shape is represented, but probably not accurately. However the turn in is given a radius of 8".
Take care when you get to your engine frames, Hyperion is from Lot 331 and as such has no lightening holes in the frames aft of the cylinder block, but they did have a circular hole ahead of the cylinder block of 12" dia. I can't remember if the DA instructions were that specific with regards to the frame holes.
These frames (front ends) were later fitted to other engines (cut and shut between the intermediate and rear driver) when the originals cracked, there were other variations in between and I've not yet managed to track down all the variations fitted to all locos in their lives, some having two frame rebuilds in their lives. Lot 331 is the easiest to model frame wise, as they only had this type of frame for their whole lives.
Depending on your modeling date she also carried two boilers, a 94HP (10/58 - 7/60 and a 94A (6/50 - 10/58 and later 7/60 - 12/63), the HP had the round dome, the A the streamlined dome.....not banjo, that's a much smaller affair carried much earlier in their lives for a short time.
Mick D