Dell Optiplex 745 form factor change

hello, I am the technology director at my church, and we use a dell optiplex 745 (desktop form factor) as our projection machine. we would like to upgrade the graphics card, as well as the power supply, but the chassis limits us to low profile cards and there are virtually no power supplies on the market that fit this case.

my question is, if I were to purchase a 745 Mini tower case, would the Motherboard from the Desktop case fit/ bolt up in it? i know i would need a new power supply, but everything else should work, if i'm not mistaken.

thanks for your help.