Outdoor shower access (froze and needs a fix)

[Cptn.Canada in MT]

So over the new year we went and did some winter RV’ing and temperatures dropped down to about 10 degees a couple of nights.

It’s actually went really well without skirting and with the help of a couple extra electric heaters however it wouldn’t be an adventure without a mishaps.

We have a Hideout 308BHDS and the outdoor shower froze up on me and sprung a leak. Nothing major that can’t be cleaned up and nothing inside got any water and luckily the cold temps froze the leak back up for us.

However I can’t seem to find any access point to get the outdoor shower out, removed the screws, cut the silicone took apart the fixture as best I could but
I couldn’t access behind the fixture or remove it at all.

Any help on doing so would be fantastic, I’m really hoping to try installing a water shut off inline so I can shut the supply to my outdoor shower and outdoor kitchen off separate to try and extend our RV’ing into the winter month more.

Thanks in advance.