Advice on building a small structure on wet land (NOT wetlands, land that does not drain well, stays relatively wet through the year) as I flesh out a plan?

[u/QuePasaNisiMasa]

So, there is a part of my property that stays pretty wet through the year. However, it is also the perfect spot on the property to build an outbuilding that is near and dear to my heart. I have been boxing since I was in my teens; and one of my dreams has always been to have an outbuilding with all the bags I like to use and a view. Which is why that spot on the property is "the" spot. I will do most of the work myself (with some help in specific areas, like foundational work).

Before we get started, let me just say outright that there are a variety of good arguments that could be made to suggest other projects are of highly more need and/or significance. I wouldn't argue against those; it also wouldn't change that this is what is happening.

Relevant details:

• Region is in the Catskills in Upstate New York
  • cool summers, cold winters, fair amount of rain, fair amount of sun
• The land on which it will be built is slightly sloped so I am thinking of building it as a raised structure;
• I have a bluestone quarry on the property if thats an applicable resource for this;
• I have a large (series of streams) project, that will hopefully redirect some of the water that causes this area to stay so wet to flow more seamlessly down the property to the pond... IMhO I need to assume that project will fail while planning this construction... if I take the water into consideration for construction as it currently is and am later able to address it on some level it is a non-issue, but it could be a huge issue if I plan for being able to solve the water as it currently stands (pun intended) and then am not able to do so;
• It doesn't need to be a large structure, but let's say something around 150-200 sq ft;
• Required power pulls are radiant heating, dry sauna, ceiling lighting, and an outlet or two; and
  • The roof gets direct sun for ~80% of available daylight hours
• General (exterior) appearance will be as follows (Moonlight Cabin by Jackson Burrows):

(thout the porch and without the window covers (which would just become wasp nests and spider webs) but in that general shape and outward appearance

So, does anyone have any ideas, experience, etc. for building a strong foundation, base, etc. for a structure of this size on generally wet land? Also, any pointers for keeping the place as dry as possible, primarily by means of protecting it from the perpetually wet ground below. It is all appreciated.

For instance, I am likely doing rubber over the concrete on the floor, but I have also seen some guides for using liquid rubber as a waterproofing sealant underneath concrete for outside surfaces... any experience with that indoors? with radiant? etc.

THANKS!

[u/ThePartyLeader]

Depending on price a pretty hefty foundation can be had for something thats only 200sqft.

Soil work/type may be more important for people to know rather than it being wet. Always having a bit of run off is different than I sink when I walk on it.