I claim i can build the vehicle within thousand pound sterling cost, but i have no idea how to launch it officially.
Now i'm working at guidance unit, you can see almost completed "brain" here
Also i bought 90 kilos (200 lb.) of sodium perchlorate for only 6750 roubles (i.e. just over $200, can provide the invoice, and this chemical is still available from that seller, at bit higher price, though,
http://rushim.ru). I converted it to AP using fertilizer-grade ammonium nitrate and sold a part of residual sodium nitrate for 1$ per kilo, so now i have about 50 kg (110 lb) of AP that cost me only $5/kg (1.5 pound sterling per pound weight). it's enough for the upper stages of the launcher.
Regulations in our country prevent any possibility of building and launching of the guided vehicle of this class and size, so i'll become a criminal exactly at the moment i'll try to assemble parts together...