That was what I meant too, 60-80 for initial make it comfy works.
I obviously dont know how strong your family ties are, but its not quite can you pop around & help me paint the door frames while I do the skirting is it.
It is really nice, will be fantastic done, you just need to as has been said and look into it very closely & get the estimates in.
I would much rather you do it than 1 of the 30 builders looking at it!
If you have 50k to play with then at least you know your budget, now get it looked at, I hope I am wrong & you get to make it happen. 🙂