I strongly disagree with you about the interfaces Martian, but I'd be very interested to hear about what specific aspects of QuickMechs GUI you feel are less well thought out than SSW's?
First, if nothing else, I don't have wide-screen display. It means that a half of your UI is hidden for me. Of course I can move it with a slider, but it's definitely not comfortable.
Second, criticals placement. SSW gives me control where I will place DHS, JJs or other equipment with a drag and drop. Quickmech does not, at least not that complete. What I find
quite very annoying (for me) is that Quickmech attempts to fill empty place and moves items to fill empty room left after removed item.
Another thing: When I wish to remove one DHS and I right-click on it, the context menu shows greyed-out option to remove it, but actually I can't do that. And if I change the number of heat sinks in the right (blue) column, just one random heat sink disappears.
If those mounts are annoying you while placing weapons, you can do them last. Place weapons first, then select endo, FF, extra HS, and they'll automatically be placed where there's room.
SSW allows me to place them as "I" see fit and in the moment "I" see fit. Your program does not.
Third, Armour. SSW gives me option to auto-balance armour by location. QuickMech does not. What I appreciate on SSW is that it combines Armour and chassis in one diagram, so I can see at a glance how many armour points I can add. SSW has option to set armour tonnage and just split up those armour points. In combination with auto-balance feature it makes this task in SSW really simple and quick.
Fourth, context menu in the right half of the UI. I hate that every time I click on some item, context menu jumps in. I find it really annoying.
Fifth, adding equipment. In SSW I can choose between either ballistic or missile or energy etc. ... equipment. So if I am deciding what cannon to use, I am listing only through tab containing them. In QuickMech the UI looks much more cluttered.
Sixth, chassis diagram and armour diagram should be together, what's the purpose of wedging two colourful diagrams between them?
Those are just a few random thoughts.
I don't know why I should use something in development stage if I can use SSW, which is stable, for free, much more comfortable to use for me, has many useful features QuickMech will probably never have, is supported on this forum.
If you want other people to use your program, than this program should offer something other comparable programs do not have. Advantage or something ... I think I stay with SSW. Just my personal opinion.