Scale Model Group Build, anyone?

Lert: My four 1/16th scale tanks, showing off the size difference between them and how they just grew larger and larger over the years:     The first one is a Heng Long Pz IV Ausf. F2, 14.5" hull length, and is in quite a sorry state. It needs minor repairs, camo, weathering, wash, detailing, tools, stowage, decals, a matte clearcoat and a new electronics package - the old one is malfunctioning, it doesn't respond well to the steering anymore.   The second one is a Heng Long JagdPanther, 17.7" hull length, and is nearly done. I've already replaced the nylon-gear gearboxes with metal-gear ones, added stowage, engine vent mesh grills, repainted and weathered. Just needs decals and a matte clearcoat.   Third one is an old Tamiya Tiger II, from the 1990s, 18" hull length. I've done extensive modifications to it, replaced the old single-motor clutch drive with two separate steel-gear gearboxes, replced the drive sprockets, replaced the plastic barrel with an aluminium turned one, scratchbuilt a barrel mounting, added a barrel elevation system, working headlight, replacement metal exhausts, replaced the tow hitches, repainted, applied camo, weathered, applied washes, stowage, engine vent mesh grills ... Just needs decals, a matte clearcoat and a new electronics package to get it mobile again.   Last one is a Torro Leopard 2A6 with steel-gear gearboxes, 18.8" hull length. Just needs weathering, a wash, decals and a matte clear-coat. Plus need to paint the commander figure and maybe add some stowage, maybe a camo net wound around the barrel.   .... yes, I like German tanks. How'd you know?       Unfortunately, in my situation it's going to take a while getting them all done - better part of a year, if not more. Especially the Pz IV is going to be a long time before it's finished.