This is going to come across as a bit strange, but if it is for cutting bread I have made one of these with the blade from a bow saw. Then a cutting guide https://www.amazon.com/Bambusi-Bread-Slicer-Cutting-Guide/dp/B077TK2H2B
Or one of these?
Could work, especially with the ability to tension the blade.
I made mine as I could only find US version not UK version. Had access to a scroll saw and wood so thought why not.
@Sharkstar started
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This is going to come across as a bit strange, but if it is for cutting bread I have made one of these with the blade from a bow saw.
Then a cutting guide https://www.amazon.com/Bambusi-Bread-Slicer-Cutting-Guide/dp/B077TK2H2B