Landships II

Good day to you all.

My first posting here, looking on this site now for a while and enjoying the knowledge that is around here!  I am building the Takom Mark IV Tadpole and have a few questions. I hope there is someone over here that can answer them: 

1. does the pictured Mark IV Tadpole with the white outlined dimensions of the normal Mark IV painted on the side have the mortar installed? Is there photographic evidence?

2. If the mortar is not installed, what would the backside look like? Is there a (standard?) platform over the crossed beams at the back? Would that be a wood platform or no platform at all?

3. It looks like that the (first?) Tadpole was tried out without the doors in the sponsons installed. Does anyone of you know a reason for leaving the doors of?

Hope to hear from you,

Greetings from Holland,

Willem