The first floor plan is definitely questionable. Slanted pews will give the poor parishoners a neckache and a great deal of disorientation. I would have no issues with it if it were in a circular church like the Pantheon, but this isn’t a circular church! There’s no need to slant the pews.
Apart from the disgraceful pews and east end walls, though, I would refrain from calling the first floor plan ‘modern’ without any description of the rest of the building. Did you know some of the earliest and most beautiful churches were in a basilica layout?

In any case, I’m not an ardent supporter of the basilica layout for new parishes. When celebrated
versus populum, it makes the mass look a bit like a performance on a stage in a school hall, although it makes more sense when you’re celebrating
ad orientem.
The second floor plan, however, does well for me. For a choir loft to work out, there must be a good high ceiling. Like the others, though, I do have an issue with the altar being so far forward. The poor priest will need to trek a long way to get to the altar from his chair. They can certainly afford to push it further back. What I really do like, though, is the allowance they made for further expansion when your parish eventually grow, and I’m sure it will grow when they are gifted with such a beautiful building. Don’t get your hopes up about side chapels though. I don’t see much room in your new parish for them, but I suppose they don’t have much money to go around.
In my worthless opinion, appointments like stained glass windows and murals can wait for later. I take the view that it is more important that a parish with a limited budget should make a good long-term investment in a good floor plan. The roots of the architectural design must be both faithful to tradition and strong in utility. Windows can be replaced any time, but foundations can’t. Though if the stained glass are directly transplanted from the old church, then why not?