1- I included the XENO structures that were missing by mistake, take note please for your comments.
2- Thanks for your comments
3- Not actually a great wh fantasy fan (but have 3 armies :D) and i liked the random terrain rules, in a game that usually people don´t use them too much because most things are blocking (a brick or a manor house) or are bothering to play with and most players just go around. The rule gave lots of life to the game with this chart.
4- Serious troubles arises about WYSIWYG but i see that you could sacrifice it a bit to get more fun IN-GAME. Imperial Structures are alike in size (statue from inquisitor, space marine, etc) many chaos alike except for the portal and the rift, xeno structures could be pretty different. But in gaming terms could be placed giving more fun and tactical choices during the game.
5- Remember that 40k use lots of scenery, because is mostly a fight in city ruins and destroyed places, more than fight in a plain battlescape like in fantasy, the rule ensures around 30% to 50% of the table covered with some kind of terrain, how is placed depends on the players.
I recomend the following distribution in a 4´x6´table (being 0 pretty empty spaces)
if you roll 5 scenery
if you roll 6 scenery
if you roll 7 scenery
Roll in number order and rearrange in the table with your opponet, try to be the more balanced remember that to start gaming you will roll to get table side by standard rule.
I tried 10 times an always were good and decent tables, pretty balanced for both sides, for being a random table gives good results because i placed the scores according to the frequency of the rolls that is not usual to get double 6 or double 1 (the second being more comon) and the common result goes around 6-8 by mid. in the tables i rolled there wasn´t a single time with warp structures (
) that´s why they are so strong powered in comparison to other structures.