Yes it is possible.
Is it possible to create a CD that will simply boot and allow a user to use remote desktop to get into a windows 2003 terminal server?
Yes it is possible.
---
Verifying of md5 checksum and burning a CD at slow speed are important.
The Knoppix 4.0.2 CD & DVD and even Damn Small Linux 50MB http://damnsmalllinux.org/ all include a package called rdesktop which can be used to connect to Windows Terminal Servers.

Acer Predator Helios Neo 16S AI 16" i9 275HX 2S RTX 5070 Ti 32GB 1TB SSD Refurb
$1690.40
Dell Latitude 14" Laptop Computer Intel i5 Up To 32GB RAM 1TB SSD Windows 11 Pro
$316.61
Samsung 9100 Pro 1TB PCIe 5.0 M.2 SSD
$225.00
External SSD 1TB 2TB 4TB Portable Hard Drive USB 3.0 Type-C High Speed PC Mac
$19.99
SAMSUNG T7 Portable SSD 1TB Indigo Blue USB 3.2 Gen2 External MU-PC1T0H/AM
$159.99
Lot of 4 1TB NVMe M.2 2280 SSD SK Hynix WD Blue SN550 P31 4TB Total
$500.00
Acer Aspire 14" AI Copilot+PC Laptop Core Ultra 5 226V Gen 4 ARC 16GB 1TB Refurb
$452.53
Crucial MX500 1TB 2.5" SATA III Internal SSD CT1000MX500SSD1
$102.99
Samsung 2.5" 870 EVO SSD SATA III 250GB 500GB 1TB Internet Solid State Drive Lot
$90.00
Western Digital Black SN770 1TB NVME SSD
$150.00