Take an LC III and graft on a 14″ Trinitron monitor along with stereo speakers. That’s what Apple did to create the 520.

With the all-in-one design, these were especially popular in schools. It even had a built-in microphone, just like the Color Classic .

Specs (via Low End Mac)

• Cpu: 25 MHz 68030
• Fpu: 68882 (optional)
• Performance: 3.2 (relative to SE); 6.3 MIPS
• Ram: 4 MB on motherboard, expandable to 36 MB using a single 80ns 72-pin SIMM; can use 1 MB, 2 MB, 4 MB, 8 MB, 16 MB, or 32 MB SIMM
• Rom: 1 MB
• L2 Cache: none
• Hard Drive: 80 or 160 MB
• Video: 512 KB VRAM, supports 640 x 480 at 8-bits
• Addressing: 24-bit or 32-bit
• Gestalt Id: 56
• Upgrade Path: LC 550 , LC 575 , LC 475/Quadra 605 motherboard, Power Mac PDS card
• Adb: 2 ports for keyboard and mouse
• Scsi: DB-25 connector on back of computer
• Serial: 2 DIN-8 RS-422 ports on back of computer
• Pram Battery: 3.6V half-AA
• Weight: 40.5 lb.
• See: Online resources and links for the Mac LC 520 (Performa 520)