You can start reading here:
https://www.rollitup.org/led-other-lighting/
I'm using LEDs, as well as many other users. There are tons of documented grows in that part of the forum if you want to look around. There's a link to mine in my signature line.
As far as DIY'ing a cabinet? I made mine for cheap, and used whiteboard for the interior wall. It cleans super easy, is already white, and appropriately reflective. I have <$1k in everything, including the mistakes and revamps. Half of that budget went into lighting, $140 into nutes.
People will speak ill of LEDs, but it's for a specific consumer. I doubt anybody on a hobbyist budget is about to ante up for LEDs to cover 1000sq.ft. HIDs have a purpose, and have grown good green for years. LED is just the new girl on the block, and she's gettin around.
My advice would be to avoid any prefabbed "grow box" and the sales pitch attached to it. Some grow stores offer "kits", but it's all off the shelf items. Usually those kits are reasonable, but never real high quality.