Customized OpenWRT / Busybox Build and Code Enhancements

Customized Build and Functionality for OpenWRT Build will be running on TP-LINK TL-WR740N or you tell me another equally priced $20.00 US. eg: http://www.amazon.com/TP-LINK-TL-WR740N-Wireless-Router-150Mpbs/dp/B002WBX7TQ/ref=pd_bxgy_e_img_y Requirements No WEB GUI Needed WAN will be static IP configured WAN will establish GRE (Simple GRE 8 byte header) to STATIC Endpoint IP Support for VLAN ID for LAN/WIFI traffic All LAN/WIFI traffic to be encapsulated in GRE (simple GRE 8 bytes) Bridged Mode packet All TCP SYN will have adjust MSS Adjusted to config value (we use 1400 but would like ability to modify) All broadcast, multicast, regular traffic just forwards on up thru the WAN/GRE Tunnel, or reverse DHCP for clients will be done by remote tunnel, so again since Broadcast, Multicast etc is forwarded, no issue New Code Requirements: DHCP Requests from client computers need to be modified for DISCOVER and REQUESTS. OPTION 82 needs to be inserted, and need to insert tunnelid and ap mac address This is all quite simple, except the addition of the new code requirements. Someone may have a better idea of how to handle, but two options we see: 1. iptables for all dhcp to a new process, that process massages message, and resends 2. modify existing dhcp server to have option to act as relay, which means no direct assigning of IP, but do massageing their and forward up. All source code, config documentation, detail of source code enhancements documented, build environment requirements, build commands, etc and working binary will need to be to provided for payment. We have no issue placing funds in escrow.