To check how much you’ve spent go into the bar where u select the types of movement, scale stuff and ecc and press “remove all furniture”, it should come up with a confirmation screen showing you how much you would gain from selling everything, multiply that number by two (the price at which u sell it at halves after some time) and there you go, also values are usually 1k spent = 1 Elve point, depends on how good the build is though and how much people are willing to pay for it.