Hi Kevin, I hadn't realised that you didn't already have a Flash. My fuel tank (with a collector sump) is fitted at the expense of the by-pass system. I acquired my flash second hand with a missing coupling duct from the intake to the by-pass pod. I only intended to fit a Wren ss so i wanted to keep the model as light as possible. I dispensed with the by-pass pod and rear dual wall ducting to save weight. I fitted the Wren single wall augmentor thrust tube with some ceramic insulation wrap which works fine. The tank was constructed from an initial blue foam mould which is destroyed when extracted from the outer glass mould so no, I wouldn't want to attempt a second one. At my time of life my time is the most valuable asset I have left. I will post some stage by stage pictures to illustrate how easy the moulding process is. Buy the model you won't regret it. There is some valuable comments and suggestions in this thread that helped me through the test flights. Ron.