IMGMAKE win95.img -size 512 512 MB is plenty for Windows 95. Edit dosbox-x.conf (or create a custom one for Win95):
Whether you’re a retro enthusiast, a developer testing legacy software, or just feeling nostalgic for the startup sound of Windows 95, running Microsoft’s iconic operating system inside a modern machine is absolutely possible — using DOSBox . Windows 95 Img Dosbox Download And Set
[autoexec] mount c "win95.img" boot c: