Okay, well, there's no technical difficulty to this job, it will just take AGES.
Convert the Background layer to a Smart Object.
Rotate to straighten: https://www.damiensymonds.net/2010/01/straightening-horizons.html
Add a Solid Color layer of orange then drag it below the image layer. (It doesn't have to be orange, but I think that will provide the most contrast in this case.)
Add a mask to the image layer, then zoom in and start painstakingly masking around the structure. Use your Shift key: https://www.damiensymonds.net/2010/10/shift-while-brushing.html
Once the entire background is orange, turn off the orange layer so that the entire background is transparent.
Save as a PSD (not PNG) ready to use in your design.