I read your moose thread from one end to the other and yes, I see you are a a large framed person. I'd never be able to acquire the eye box with rings that high. Very good read btw.
I've had some close encounters with moose in Canada myself but not in the hunting perspective. I learned real quick when on a snowmachine, you give any moose a wide berth.
Didn't know they floated until I read your thread. Interesting. Moose is **** good meat. I rank it right there with elk.
That brush gun will make a dandy offhand shooter. Strictly my opinion, I'd loose the bipod and/or add another post back a bit from the front one and at the bottom for a sling and you will be in business. You'll find that out for yourself. The bipod quickly becomes a deterrent.
Exactly what we do here for whitetails. Most everything is an offhand snap. If I can prep a shot, I do, using a tree branch or my knee in a sitting position but most times it's a snap shot. I use a 308 lightweight Savage (no brake) with a low power Vortex PST (4-16 at 4x) but Iron sights would suffice just fine and SGK's in Federal Brass with a medium load of H335, 0.030 off the lands. The key is a light weight rifle with quick target acquisition. The heavier the rifle, the more it takes to get that snap shot off and have it be an accurate shot. It's an entirely different discipline than long range shooting, entirely different.
I own a big boomer but I'd never consider it to be an offhand shooter, I'm not Charles Atlas.
The one thing I kick myself for was not getting a snot stock (I have a walnut stock), something I'll probably end up doing anyway. Wood stocks take a beating on a brush gun whereas a snot stock can take the abuse.
Have fun, I know you will.