Home Depot has their 46" 9 drawer rolling tool cabinet on sale until next Sunday. It’s $199 (normally $398) and except for bolting the casters and handle on it’s all assembled. It’s heavy (200lbs). Casters are rated for 1200 lbs and drawers for 100 lbs so there’s no way you’ll overload it with your GF. Two swivel casters lock as well.
The top is wood and 46"x18" so the GF will sit on top with some room on the side for your laptop or flatbed scanner. The height of the top is about 37" putting the GF at a nicely accessible height.
The top drawer spans the width and will hold materials as large as the GF can take. The other drawers are a bit under 20" but are 15" deep so they’ll take fairly common sized 18x12 sheet goods. There are also 2 tall drawers in case you want to store stuff in bulk - the others are shallower so are good for ready access to stock.
Not quite as good as one that’s purpose built with drawers or shelves sized to the GF bed but tough as nails and saves hours of construction time.
Here’s the link.