Some MaLa Layouts are scaleable and may be running at your desktop resolution others are fixed. There may be a better way but I would run the layout editor MalaLayout.exe and open your layout then go to layout > fixed size.

If not, as in the example above, then check the scaling setting

In this example MaLa would be running at my windows desktop resolution when using this particular layout.
I can't help you at all with your scan line generator but hopefully that helps you at least get a piece of the puzzle together.
I've never used any other front ends but I do like MaLa a lot.
Cheers

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