it can be designed using any material available (such as wood and concrete) that can hold the soil above ground. over the years, i have had many different jobs including owning my own business. click here to see other designs by earl that are ready to be shipped now. don’t forget to put your name in the header. my room was excellent (on 5th floor) and suffered from no noise at all - and the trains were running, i used them every day. bring an elephant to leave, so you increase the size of the herd. 