Hello Magpie, glad to see your back at it ...You may have been looking at my u- boat modified to represent U-69 a type V11c instead of the U-47. The accurate armour tower is the doggies...but is resin so you have to get inside it and lighten it somewhat, Mankster is correct about the belows on the inside, i modified mine to have the bellows on both inside and outside (belt and braces I know but) What size tank are you using ? if i may offer some advice ( if you havn't already done so ) is to strengthen the tray up a bit , I put some 4mm steel sq rod into the upper section of the " H " sectional strengthener at the bottom of the tray to beef it up and also down the sides of the tank full length of the tray and epoxied them in, you can now pick up the tray at on end and it stays level without sagging.Got some pics if you should need any info. I have also converted the Type XX1 robbe to static with loads of mods. cheers sub